Math, asked by sandhujeet560, 1 year ago

If A+B+C= 180 then prove that ,
Cos 4A +Cos 4B +Cos 4C =-1+4Cos2A Cos 2B Cos 2C

Answers

Answered by athar786md18gmailcom

1

Step-by-step explanation:

A+B+C= 180

cos4A+cos4B+cos4c

cos4(A+B+C) =180

cos 4A +cos4B -sin 4(2a)

cos4-tan4c

1+4cos 2a+cos2b+cos2c

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