`tantheta+tan(9 0^(@)-theta)=secthetaxxsec(9 0^(@)-theta)`

Prove that : tantheta+tantheta+tan(90^(@)-theta)=sectheta*sec(90^(@)-theta)

tantheta .tan(90^(@) - theta) =

tantheta .tan(90^(@) - theta) =

tantheta=? tan(90-theta)=?

tan 3theta = tan 2theta + tantheta

9tan^(2)theta-9Sec^(2)theta=?

tan3theta + tantheta = 2tan 2theta

tantheta+tan2theta=tan3theta

frac(sintheta [(1-tantheta) tan theta+sec^2 theta])((1-sintheta) tantheta(1+tan theta) (sec theta+tantheta)) =?

tantheta+tan(6 0^0+theta)+tan(12 0^0+theta)=3tan3theta