Question

The value of sin (n+1) A sin (n+2) A + Cos (n+1) A Cos (n+2) A is equal to
a) Sin A b) Cos A
c) -Cos A
d) Sin 2 A​

Answer 1

Answer:

cos (n+2,)a is equal to sin2 A

Answer 2

Answer:

d

Step-by-step explanation:

meri meri Marjimeri Marji main kuchh bhi Karun meri Marji meri meri