Math, asked by nareys2003, 7 months ago

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

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Answered by mayankmahajan33

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Answer:

1:31

Prove that: `sin(n+1)A sin(n+2)A+cos(n+1)A cos(n+2)A ...

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Jun 22, 2018

watch this video on youtube it will explain properly here no one can explain

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