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Evaluate:
cos 60°. cos 30° - sin 60°. sin 30°.

cos 60°. cos 30° - sin 60°. sin 30°.
= $1 half cross times fraction numerator square root of 3 over denominator 2 end fraction minus fraction numerator square root of 3 over denominator 2 end fraction cross times 1 half equals fraction numerator square root of 3 over denominator 4 end fraction minus fraction numerator square root of 3 over denominator 4 end fraction equals 0.$

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Evaluate:cos 60°. cos 30° - sin 60°. sin 30°.

Introduction to Trigonometry

Mathematics

Evaluate:
cos 60°. cos 30° - sin 60°. sin 30°.