Math, asked by aviswan60, 10 months ago

(cos4 A - sinn4 A ) =

Answers

Answered by bshweta31

0

cos 4A i think so..................

Answered by anmochaudharyp9zvdc

0

Answer:

Cos 4A-sin4A

=cos(2.2A)-sin(2.2A)

=(2cos²2A-1)-(1-2sin²2A)

=2cos²2A-1-1+2sin²2A

=2(sin²2A+cos²2A)-2

=2-2 [∵,sin²Ф+cos²Ф=1]

=0

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