is equal to
12cos-1sin2x + C
tan-1sin2x + C
tan-12sin2x + C
A.
12sin-1sin2x + C
Let I = ∫sinxcosx1 - sin4xdxPut sin2x = t ⇒ 2sinxcosxdx = dt∴ I = ∫dt21 - t2 = 12sin-1t + C = 12sin-1sin2x + C