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Maths-

General

Easy

Question

The angle between the pair of lines $2 x to the power of 2 end exponent plus 5 x y plus 2 y to the power of 2 end exponent plus 3 x plus 3 y plus 1 equals 0 text is end text$

${C o s}^{- 1} (\frac{4}{5})$
${T a n}^{- 1} (\frac{4}{5})$
0
$π / 2$

The correct answer is: $C o s to the power of negative 1 end exponent invisible function application open parentheses fraction numerator 4 over denominator 5 end fraction close parentheses$

$c o s invisible function application theta equals fraction numerator vertical line a plus b vertical line over denominator square root of left parenthesis a minus b right parenthesis to the power of 2 end exponent plus 4 h to the power of 2 end exponent end root end fraction$

Related Questions to study

$x to the power of 2 end exponent plus k subscript 1 end subscript y to the power of 2 end exponent plus 2 k subscript 2 end subscript y equals a to the power of 2 end exponent$ represents a pair of perpendicular lines if

$x to the power of 2 end exponent plus k subscript 1 end subscript y to the power of 2 end exponent plus 2 k subscript 2 end subscript y equals a to the power of 2 end exponent$ represents a pair of perpendicular lines if

$text The value of end text lambda text with end text vertical line lambda vertical line less than 16 text such that end text$ $2 x to the power of 2 end exponent minus 10 x y plus 12 y to the power of 2 end exponent plus 5 x plus lambda y minus 3 equals 0$ represents a pair of straight lines is

$text The value of end text lambda text with end text vertical line lambda vertical line less than 16 text such that end text$ $2 x to the power of 2 end exponent minus 10 x y plus 12 y to the power of 2 end exponent plus 5 x plus lambda y minus 3 equals 0$ represents a pair of straight lines is

The value of l such that $lambda x to the power of 2 end exponent minus 10 x y plus 12 y to the power of 2 end exponent plus 5 x minus 16 y minus 3 equals 0$ represents a pair of straight lines is

The value of l such that $lambda x to the power of 2 end exponent minus 10 x y plus 12 y to the power of 2 end exponent plus 5 x minus 16 y minus 3 equals 0$ represents a pair of straight lines is

parallel

If the equation $2 x y plus g x plus f y plus 5 equals 0$ represents a pair of lines, then fg =

If the equation $2 x y plus g x plus f y plus 5 equals 0$ represents a pair of lines, then fg =

$text If end text 4 x y plus 2 x plus 2 f y plus 3 equals 0$ represents a pair of lines then f =

$text If end text 4 x y plus 2 x plus 2 f y plus 3 equals 0$ represents a pair of lines then f =

The product (A) and (B) are:

The product (A) and (B) are:

chemistry-General

parallel

Which of the following reactions do not involve oxidation-reduction?
I) $2 Cs plus 2 straight H subscript 2 straight O not stretchy ⟶ 2 CsOH plus straight H subscript 2$
II) $2 CuI subscript 2 not stretchy rightwards arrow 2 CuI plus straight I subscript 2$
III) $NH subscript 4 Br plus KOH not stretchy rightwards arrow KBr plus NH subscript 3 plus straight H subscript 2 straight O$
IV) $4 KCN plus Fe left parenthesis CN right parenthesis subscript 2 not stretchy rightwards arrow straight K subscript 4 open square brackets Fe left parenthesis CN right parenthesis subscript 6 close square brackets$

Which of the following reactions do not involve oxidation-reduction?
I) $2 Cs plus 2 straight H subscript 2 straight O not stretchy ⟶ 2 CsOH plus straight H subscript 2$
II) $2 CuI subscript 2 not stretchy rightwards arrow 2 CuI plus straight I subscript 2$
III) $NH subscript 4 Br plus KOH not stretchy rightwards arrow KBr plus NH subscript 3 plus straight H subscript 2 straight O$
IV) $4 KCN plus Fe left parenthesis CN right parenthesis subscript 2 not stretchy rightwards arrow straight K subscript 4 open square brackets Fe left parenthesis CN right parenthesis subscript 6 close square brackets$

chemistry-General

A transverse wave is travelling along a string from left to right The figure below represents the shape of the string at a given instant At this instant the points have an upward velocity are (here X-wave displacement, Y-particle displacement)

A transverse wave is travelling along a string from left to right The figure below represents the shape of the string at a given instant At this instant the points have an upward velocity are (here X-wave displacement, Y-particle displacement)

physics-General

A pulse in a rope approaches a solid wall and it gets reflected from it

The wave pulse after reflection is best represented by _____

A pulse in a rope approaches a solid wall and it gets reflected from it

The wave pulse after reflection is best represented by _____

physics-General

parallel

Transverse waves are produced in a long string by attaching its free end to a vibrating tuning fork Figure shows the shape of a part of the string The points in phase are

Transverse waves are produced in a long string by attaching its free end to a vibrating tuning fork Figure shows the shape of a part of the string The points in phase are

physics-General

At any instant a wave travelling along the string is shown in figure Here, if point A is moving upward, the true statement is

At any instant a wave travelling along the string is shown in figure Here, if point A is moving upward, the true statement is

physics-General

Figure shows the shape of a string, the pairs of points which are in opposite phase is

Figure shows the shape of a string, the pairs of points which are in opposite phase is

physics-General

parallel

Suggest a suitable oxidizing reagent for the following conversions:

Suggest a suitable oxidizing reagent for the following conversions:

chemistry-General

Satellite $A$ and $B$ are revolving around the orbit of earth. The mass of $A$ is 10 times of mass of B. The ratio of time period $open parentheses T subscript A over T subscript B close parentheses$ is

Satellite $A$ and $B$ are revolving around the orbit of earth. The mass of $A$ is 10 times of mass of B. The ratio of time period $open parentheses T subscript A over T subscript B close parentheses$ is

physics-General

$text (B) end text not stretchy ⟵ with NaBH subscript 4 on top text Ethanoic anhydride end text not stretchy ⟶ with LAH on top left parenthesis straight A right parenthesis not stretchy downwards arrow straight H subscript 2 divided by Pt left parenthesis straight C right parenthesis$ The products (A) , (B) , and (C) are:

$text (B) end text not stretchy ⟵ with NaBH subscript 4 on top text Ethanoic anhydride end text not stretchy ⟶ with LAH on top left parenthesis straight A right parenthesis not stretchy downwards arrow straight H subscript 2 divided by Pt left parenthesis straight C right parenthesis$ The products (A) , (B) , and (C) are:

chemistry-General

parallel

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