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If cos (α + β) = 0, then value of cos((α + β)/2) is equal to :
Evaluate : 2√2 cos 45° sin 30° + 2√3 cos 30°
If A = 60° and B = 30°, verify that : sin (A + B) = sin A cos B + cos A sin B
An observer 1.8 m tall stands away from a chimney at a distance of 38.2 m along the ground. The angle of elevation of top of chimney from the eyes of observer is 45°. The height of chimney above the ground is
It is given that sin (A − B) = sin A cos B − cos A sin B. Use it to find the value of sin 15°.
If sin A = y, then express cos A and tan A in terms of y.
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