Question
If cos3A + cos3B + cos3C =1 then one of the angles of ΔABC is
The correct answer is:
Related Questions to study
Let points A(7, 5), B(2, 1), C(10, 3) the vertices of a ΔABC. I is incentre of ΔABC. E and D are points of contact of incircle and sides AC and BC of ΔABC respectively. If G is the intersection points of angle bisector of ΔB and line joining ED. Then angle between line AG and BG is
Let points A(7, 5), B(2, 1), C(10, 3) the vertices of a ΔABC. I is incentre of ΔABC. E and D are points of contact of incircle and sides AC and BC of ΔABC respectively. If G is the intersection points of angle bisector of ΔB and line joining ED. Then angle between line AG and BG is
In a ΔABC as in given figure 
and 
find the ratio of 
In a ΔABC as in given figure and find the ratio of
If 
then 
=
If then =
If the acceleration of the elevator 
, then
If the acceleration of the elevator , then
Which of the following options is correct for the object having a straight line motion represented by the following graph?
Which of the following options is correct for the object having a straight line motion represented by the following graph?
The principal value of 
where 
is
The principal value of where is
In the arrangement shown in figure all surfaces are smooth. Select the correct alternative(s)
In the arrangement shown in figure all surfaces are smooth. Select the correct alternative(s)
If 
then = - ... -
If then = - ... -
In the pulley system shown in figure the movable pulleys A,B and C are of mass 1 kg each. D and E are fixed pulleys. The strings are light and inextensible. Choose the correct alternative(s). All pulleys are frictionless.
In the pulley system shown in figure the movable pulleys A,B and C are of mass 1 kg each. D and E are fixed pulleys. The strings are light and inextensible. Choose the correct alternative(s). All pulleys are frictionless.
The motion of a particle along a straight line is described by equation:
Where 
is in metre and 
in second. The retardation of the particle when its velocity becomes zero, is
The motion of a particle along a straight line is described by equation:
Where is in metre and in second. The retardation of the particle when its velocity becomes zero, is
The velocity-time and acceleration-time graphs of a particle are given as
Its position-time graph may be given as
The velocity-time and acceleration-time graphs of a particle are given as
Its position-time graph may be given as
A body is moving in a straight line a shown in velocity-time graph. The displacement and distance travelled by in 8s are respectively
A body is moving in a straight line a shown in velocity-time graph. The displacement and distance travelled by in 8s are respectively
In order to raise a mass of 100 kg a man of mass 60 kg fastens a rope to it and passes the rope over a smooth pulley. He climbs the rope with an acceleration 5g/4 relative to rope. The tension in the rope is 
In order to raise a mass of 100 kg a man of mass 60 kg fastens a rope to it and passes the rope over a smooth pulley. He climbs the rope with an acceleration 5g/4 relative to rope. The tension in the rope is
Two blocks A and B of equal mass m are connected through a massless string and arranged as shown in figure. Friction is absent everywhere. When the system is released from rest
Two blocks A and B of equal mass m are connected through a massless string and arranged as shown in figure. Friction is absent everywhere. When the system is released from rest
and 
