Question

Question #480a9

Answer 1

`-sin^2x`

Explanation:

Since

`1-sin^2x=cos^2x`

and `secx=1/cosx`

you have

`(1-sin^2x)(1-sec^2x)=`

`cos^2x(1-1/cos^2x)=`

`cancel(cos^2x)(cos^2x-1)/cancel(cos^2x)=`

`-sin^2x`