Use identities to find values of the sine and cosine

Last updated: 7/29/2022

Use identities to find values of the sine and cosine functions for the angle measure. θ, given that cos2θ= and 90° < θ < 180 sinθ = (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression. Rationalize all denominators.) cosθ= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression. Rationalize all denominators.)