Question

evaluate :
∫
cos² x dx ​

Answer 1

Step-by-step explanation:

∫ cos²x dx

= 1/2 ∫ 2cos²x dx

= 1/2 ∫ (1+cos2x) dx

=1/2 { ∫ dx + ∫ cos2x dx }

=1/2 (x + sin2x/2) + C

= x/2 + sin2x/4 + C

Hope it helps you