Sec theta sin thetatan theta cot theta sin2 theta csc2 the

Sec theta sin theta/tan theta + cot theta = sin^2 theta csc^2 theta tan^2 theta - 1 = tan^2 theta sec x - tan x sin x = 1/sec x

Solution

13) sectheta*sintheta/(tantheta + cotheta) = sin^2theta

LHS : (sintheta/costheta)/( tantheta + 1/tantheta)

tantheta*tantheta/(1+tan^2theta)

tan^2theta/sec^2theta

sin^2theta/cos^2theta*sec^2theta

sin^2theta

RHS