cos (A+B)×cos (A-B)=-sin2Asin2B
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by using the property of cos(A+B)*cos(A-B)
you can directly write the answer..
no need to further prove...
you can directly write the answer..
no need to further prove...
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JOSHUA999123:
can u plz explain in detail
ans should be -sin2Asin2B
see its a property
the formula of cos will give u direct value
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