rai zan

A pendulum of length 10 cm has swung so that theta is the radian measure of the angle formed by the pendulum and a vertical line .Show that the number of centimeters in the vertical height of the end of the pendulum above its lowest position is 20 sin squ...

Obtain an identity for the first function value in terms of the second function value. cos 3x ; cos x

Can i have a solution on how i can derive on this answer 4cos^3x - 3 cos x.....please..

Use a half measure identity to find the exact value.. Cos t= 1/3 and 0 <t<1/2 pie find sin 1/2 t..