Question #2f3f7

1 Answer
Feb 13, 2017

LHS=(cottheta-tantheta)/(sinthetacostheta)

=cottheta/(sinthetacostheta)-tantheta/(sinthetacostheta)

=costheta/(sintheta*sintheta*costheta)-sintheta/(costheta*sintheta*costheta)

=1/sin^2theta-1/cos^2theta

=csc^2theta-sec^2theta=RHS

Proved