Question

32. sin’a + cos? (a + B)
+ 2 sin a sin ß cos(a + b)=
1) sin’a 2) sinB 3) cos’ a 4) cos? B some one please help ​

Answer 1

Answer:

4. cos^2 beta.

I have attached the Answer. trick is to Know Cos( a+b).cos(a-b) formulae. please do mark brainliest , and welcome more questions. Thanks.