Math, asked by tejaskpatil2077, 1 year ago

show that cos 40+ cos 50 + cos 70 +cos 80 + = cos 20+ cos 10

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Answered by Gitashree11

0

270 cos is the answer

Answered by abhikun

5

using cos C+ cos D =2*cos[(C+D)/2]*cos[(C-D)/2] formula

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