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If x = cos 30° – sin 30° and y = tan 60° – cot 60°, then
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.
The value of (2 tan 60°)/(1 − tan² 60°) is same as the value of
(1 − tan²30°)/(1 + tan²30°) is equal to
sec A = 2 cos A is true for A =
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