Identify the expression that completes the equation so....

[KZ]

The Question is: Identify the expression that completes the equation so that it is an Identity.

cosX/1+sinX=?

a)1-sinX/cosX

b)cosX

c)1+sinX/cosX

d)1+cscX/cscX

Thanks for all your help!!!

 

[skeeter]

\(\displaystyle \L \frac{\cos{x}}{1+\sin{x}} \cdot \frac{1-\sin{x}}{1-\sin{x}}\)

complete the multiplication and simplify the result to get one of the choices.