Math, asked by deepthiseshadri2004, 1 month ago

prove that 1+COS2x + COS4x + Cos6x = 4 cosx COS2x cos 3x

Answers

Answered by gauravshrigiri22

0

Answer:

⇒(1+cos2x)+(cos6x+cos4x)−4cosxcos2xcos3x

⇒2cos

2

x+2cos5xcosx−4cosxcos2xcos3x

=2cosx[cos5x+cosx]−4cosxcos2xcos3x

=2cosx(2cos3xcos2x)−4cosxcos2xcos3x

=4cosxcos2xcos3x−4cos4xcos2xcos3x

=0

I hope it's help you

please make me brainliests

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