Math, asked by kairasenthil, 11 months ago

cos 100°.cos40°+sin100°.sin40° what is the value

Answers

Answered by srishti2405

2

Using identity=

cosAcosB+sinAsinB=cos(A-B)

A=100

B=40

Cos100.cos40+sin100sin40=cos(100-40)=cos60

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