Question

The value of sin ((n + 1) A). Sin ((n + 2) A] + cos [( n + 1) A] x cos [(n+ 2) A) is equal to
A) sin A
B) COS A
C) - Cos A
D) sin 2A​

Answer 1

$\huge{\underline{\mathtt{\red{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}}}}$

c) - Cos A