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Maths-

General

Easy

Question

If in a $increment A B C comma cos invisible function application 3 A plus cos invisible function application 3 B plus cos invisible function application 3 C equals 1 comma blank$ then one angle must be exactly equal to

$90 °$
$45 °$
$120 °$
None of these

The correct answer is: $120 degree$

Since $blank cos invisible function application 3 A plus cos invisible function application 3 B plus cos invisible function application 3 C equals 1$
$rightwards double arrow 4 sin invisible function application fraction numerator 3 A over denominator 2 end fraction sin invisible function application fraction numerator 3 B over denominator 2 end fraction sin invisible function application fraction numerator 3 C over denominator 2 end fraction equals 0$
Either $blank fraction numerator 3 A over denominator 2 end fraction equals 180 degree$ or $fraction numerator 3 B over denominator 2 end fraction equals 180 degree blank$ or $blank fraction numerator 3 C over denominator 2 end fraction equals 180 degree$
Either $A equals 120 degree blank$ or $blank B equals 120 degree blank$ or $C equals 120 degree$

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