Answer-Evaluate the following. sin 25° sin 65° – cos 25° cos 65°.

Question

Answer-Evaluate the following. sin 25&deg; sin 65&deg; &ndash; cos 25&deg; cos 65&deg;.

Accepted Answer

sin 25 sin 65  cos 25 cos 65 We know that the formula is cos A  B  cos A cos B - sin A sin B -cos A  B  sin A sin B - cos A cos B so, sin 25 sin 65 - cos 25cos 65 can be written as  -cos25  65  -cos 90  0

Evaluate the following. sin 25° sin 65° – cos 25° cos 65°.

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