Math, asked by aamirkhanmansuri2004, 6 months ago

prove that
Cos20⁰+cos100⁰+cos140⁰=cos90⁰

Answers

Answered by rakhikumari288

0

Answer:

(Cos20+cos140) +cos (90+10)

2 cos80 cos60 - sin10 = cos80 - sin10

Sin10 - sin10

0 = cos 90

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