Math, asked by rtpavan2005, 10 months ago

cos1 +cos2..... cos89

Answers

Answered by Prapti2004

1

Answer:

The answer is 0.

cos1+cos2+cos3........+cos89

=cos1+cos2+cos3.....+cos(90-2)+cos(90-1)

=cos1+cos2+cos3...…-cos2-cos1

=0

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