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Evaluate the expression cos 60° cos 30° - sin 60° sin 30°.
This equals cos(60 + 30) deg. Give its numeric value.

Class 10Trigonometric Ratios of Standard AnglesTrigonometry

A0
B1
C-1
D2

Step-by-Step Solution

cos 60 cos 30 - sin 60 sin

30 = (\frac{1}{2}) (\frac{3}{2}) - (\frac{3}{2}) (\frac{1}{2}) = 0

. This is cos 90° = 0.

Answer: A) 0

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