Math, asked by tanishkaa15, 7 months ago

2.
cos
s ((n +1)a )cos((n-1)a)
+ sin((n+1)a )sin((n-1)a) =

Answers

Answered by itshreesatpathy

0

Answer:

20is the answer of your question

Answered by abhinav3161

1

Answer:

20 IS THE CORRECT ANSWER..

Step-by-step explanation:

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