Math, asked by vineethavinee, 7 months ago

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

Answers

Answered by dkyadav94

2

Step-by-step explanation:

sin(n+1)Asin(n-1)A+cos(n+1)Acos(n-1)A=cos2A.

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