Question

derivative of θtanθ secθ

Answer 1

= xtanx*d(secx)/dx + secx * d(xtanx)/dx

d(xtanx)/dx = x sec^2x + tanx

d (secx) /dx = tanx sec x

derivative = x tan^2 x secx + sec x (x sec^x + tanx)

= x tan^2x secx + x sec^3x + tanx sec x

Answer 2

oh - and x = theta!!