3cos^2 325+3sin^2 755

Question

3cos^2 325+3sin^2 755

Answer 1

3Cos²325 + 3Sin²755 = 3[Cos²(360 - 35) + Sin²(720 + 35)] =
 = 3(Cos²35 + Sin²35) = 3 * 1 = 3