Question

anybody please tell me correct answer.if anyone didn't know answer then please don't write anything ​

Answer 1

Answer:

use the concept of sin a + b into sin of a minus b is equals to 2 sin a sin b and Cos A + B into Cos A minus b is 2 cos a cos b solve this

Answer 2

Step-by-step explanation:

Given that:-

Sin(75+A)Sin(75-A)-Cos(15+A)Cos(15-A)

Sin(75+A)Sin(75-A)-Cos(90-75+A) Cos(90-75-A)

Sin(75+A)Sin(75-A)-Cos(90-(75-A) Cos(90-(75+A)

Cos(90-A)=SinA

Sin(75+A)Sin(75-A)- Sin(75-A)Sin(75+A)

=0