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

##### 1 Answer

Mar 27, 2018

It simplifies to

#### Explanation:

Recall that

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

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

#=sin^2beta - 1#

Recall that

#=-cos^2beta#

Hopefully this helps!