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## Homework Statement

Angles

*x*and

*y*are located in the first quadrant such that sinx=4/5, and cosy = 7/25.

a) Determine an exact value of cosx.

b) Determine an exact value of siny.

c) Determine an exact value for sin(x+y)

## Homework Equations

Compound angle formulas perhaps? I don't really know, that's the problem!

## The Attempt at a Solution

I'm really at a loss here, do I just sub those into some formula or something? Can anyone help me out? Or get me pointed in the right direction? thanks in advance!