Question

differentiation cos ² x​

Answer 1

yarr abhi exam dekar aayi main jaane tha ye question

Answer 2

$heya \\ \\ let \: \cos {}^{2} (x) = f(x) \\ \\ f(x) = \cos {}^{2} (x) \\ \\ now \: Differentiate \: both \: sides \\ w.r.t.x \: we \: have \\ \\ f {}^{1} (x) = - 2 \ \cos(x) \times \sin(x)$