Math, asked by sarveshsn59, 1 year ago

4sin(7x+4y)sin(4y-7x)=?

Answers

Answered by nikkychoudhary159

2

=2*2sin(7x+4y)sin(4y-7x)

=2(cos(7x+4y+4y-7x)-cos(4y-7x-7x-4y))

=2(cos(8y)-cos(-14x))

=2cos8y-2cos 14x

sarveshsn59: Thanks i was trying hard but wasnt getting those answers

sarveshsn59: Nikki your answer is wrong but u were really close by

nikkychoudhary159: sorry,i have done one mistake

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