Math, asked by preetimehra766, 1 year ago

9. sin (n+1) A sin (n-1)A + cos(n+1)A
cos(n-1) A=cos2A
11. tan 69° + tan 66°/1- tan 69º tan 66°
= -1
plzz help
..​

Answers

Answered by mansnotzombie
1

Answer:

Refer to attached figure

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Answered by Anonymous
2

Answer:

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