MENU
Question -

Prove that: sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x = cos x



Answer -

LHS = sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x

Comment(S)

Show all Coment

Leave a Comment

Free - Previous Years Question Papers
Any questions? Ask us!
×