Math, asked by shahrumali9733, 10 months ago

PROVE THAT

1/(cos a+cos 3a) +1/(cos a+cos 5a) +1/(cos a +cos 7a)+.......+1/(cos a+cos (2n+1)a) =1/2cosec a [tan (n+1)a-tan a].

Answers

Answered by mahhi1096drc

0

Answer:

1/(cos a+cos 3a) +1/(cos a+cos 5a) +1/(cos a +cos 7a)+.......+1/(cos a+cos (2n+1)a) =1/2cosec a [tan (n+1)a-tan a

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