4sin(7x+4y)sin(4y-7x)=?
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=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
Nikki your answer is wrong but u were really close by
sorry,i have done one mistake
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