Question

Question #9a3ca

Answer 1

Very simple approach...
See the answer below...
Hope it helps...

Explanation:

We definitely know `color(red)(sin^2x+cos^2x=1`

If we get `sinx=1/2` then we can use the formula,
i.e,
`(1/2)^2+cos^2x=1`
`=>cos^2x=3/4`
`=>cosx=sqrt3/2`

Similarly,
`(1/4)^2+cos^2y=1`
`=>cos^2y=15/16`
`=>cosy=sqrt15/4`

Thank you...