Math, asked by nareys2003, 6 months ago

15. Prove that sin (n + 1) 0 .sin(n-1) +
cos ( n + 1)e . cos (n - 1)0 = cos 20, n€Z

Answers

Answered by drstaranee

2

Answer:

proved .............

Answered by arsheen2007

0

Answer:

proved..................

Step-by-step explanation:

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