Question

verify the indentity
cos (x - y) - cos (x + y) = 2 sin x sin y

Answer 1

@ZakaullahUET

Answer 2

ok do you know the formula of

\[\cos(x-y) \text{ and } \cos(x+y) ?\]

Answer 3

yes

Answer 4

ok then substitute that in the above equation. You will surly get the answer!

Answer 5

*surely

Answer 6

im not exactly sure how to. can you walk me throught it?

Answer 7

first show me ur substution

Answer 8

*substitution

Answer 9

@mgarcia634 ?