Express cos(P+Q) in terms of trigonometric ratios of P and Q

Question

asked Sep 11, 2024 10.3k views

1 Answer

Adam Elsodaney · Answer 1 · 2024-09-17T02:08:47+0000

Answer:

cosPcosQ - sinPsinQ

Explanation:

using the addition identity

• cos(x + y) = cosxcosy - sinxsiny

then

cos(P + Q) = cosPcosQ - sinPsinQ