given some information about theta, and 0 is less than or equal to theta less than 2 pi, find sin 2 theta, cos2 theta, and tan 2 theta. A.) cos theta=-1/4 B.) sec theta=5/2 C.) sin theta = 3/5

Answer 1

Using Pythagoras determine the values of all sines, cosines, and tangents/

Then substitute appropriate values into the formula.