(cos x + cos y)^2 + (sin x +sin y)^2 = 4 cos ^2 (x-y)/2
Prove
Answers
Answered by
4
Step-by-step explanation:
hope it helps you.......
Attachments:

Answered by
3
Step-by-step explanation:
plz mark me as brainliest and plz follow me
Attachments:

Similar questions