Math, asked by JOSHUA999123, 1 year ago

cos (A+B)×cos (A-B)=-sin2Asin2B

Answers

Answered by tarang3
1
by using the property of cos(A+B)*cos(A-B)
you can directly write the answer..
no need to further prove...
Attachments:
JOSHUA999123: can u plz explain in detail
JOSHUA999123: ans should be -sin2Asin2B
tarang3: see its a property
tarang3: the formula of cos will give u direct value
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