Question

Question #15e37

Answer 1

`1-sin^2y/(1+cosy)+(1+cos y)/sin y-sin y/(1-cos y)`

`=1-(1-cos^2y)/(1+cosy)+((1+cos y)(1-cosy)-sin^2y)/(sin y(1-cos y))`

`=1-1+cosy+((1-cos^2y)-sin^2y)/(sin y(1-cos y))`

`=cosy+(sin^2y-sin^2y)/(sin y(1-cos y))`

`=cosy`