# Math

posted by
**Jake** on
.

Explain how to do this with steps please.

1. Simplify cos(x-y)+cos(x+y)/cosx

Formula: cosxcosy= cos(x+y)+cos(x-y)/2

cos(x-y)+cos(x+y)/cosx

=cosxcosy/2cosx

posted by
**Jake** on
.

Explain how to do this with steps please.

1. Simplify cos(x-y)+cos(x+y)/cosx

Formula: cosxcosy= cos(x+y)+cos(x-y)/2

cos(x-y)+cos(x+y)/cosx

=cosxcosy/2cosx