Write this expression in terms of sine and cosines and simplify? (Cosßtanß+1) (Sinß-1)

1 Answer
Mar 27, 2018

It simplifies to -cos^2beta.

Explanation:

Recall that tanbeta = sinbeta/cosbeta.

=(cosbeta(sinbeta/cosbeta) + 1)(sin beta - 1)

=(sin beta + 1)(sinbeta- 1)

=sin^2beta - 1

Recall that sin^2x +cos^2x= 1.

=-cos^2beta

Hopefully this helps!