100 POINTS + BRAINLIEST!!!

Let sine of theta equals the quantity 2 times radical 2 end quantity over 5 and pi over 2 is less than theta is less than pi period

Part A: Determine the exact value of cos 2θ.

Part B: Determine the exact value of sine of the quantity theta over 2 end quantity period

100 POINTS BRAINLIEST Let sine of theta equals the quantity 2 times radical 2 end quantity over 5 and pi over 2 is less than theta is less than pi period Part A class=