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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
If x(2 tan 30°/(1 + tan² 30°)) = y(2 tan 30°/(1 – tan² 30°)), then x : y =
In the adjoining figure, TP and TQ are tangents drawn to a circle with centre O. If ∠OPQ = 15° and ∠PTQ = θ, then find the value of sin 2θ.
If x = cos 30° – sin 30° and y = tan 60° – cot 60°, then
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