Math, asked by royaljaya79, 2 months ago

cos (n + 1) a cos (n-1) a + sin(n+1) a sin (n - 1)a=

A cos 2na
B sin 2na
C cos 2a
D sin 2a

Answers

Answered by kimjisoo13690

0

Answer:

vehshhsjfjgkjajsjkkckxjnsN

jhgjkhygkiuyghlikh

Step-by-step explanation:

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