Math, asked by tekchand2001, 1 year ago

Cos4a-sin4a Simplify it

Answers

Answered by khushraj2005
1

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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