Math, asked by rameshsarupuru, 4 months ago

Show that cos 100° cos 40° + sin 100° sin 40º =1/2.

Answers

Answered by IINiRII

5

Answer:

A=100° & B=40°

cos 100°.cos 40° + sin 100° .sin 40°

=cos(100°-40°)

=cos(60°)

and value of cos(60°)=1/2=0.5

Hence

Cos100°.cos40°+sin100°.sin40° = 1/2

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