Math, asked by anoopmeena6, 11 months ago

1 + cos 2x + cos 4x+cos 6x= 4cos x cos 2x cos 3x how?????

anoopmeena6: i do it

Answers

Answered by Anonymous

19

1 + cos2x + cos4x + cos6x
=(1 + cos6x ) +(cos2x + cos4x)
= 2(cos3x)^2+ 2 cos 3xcosx
= 2cos3x[cos3x+cosx]
= 2cos3x(2cos2xcosx)
= 2cosxcos2xcos3x

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