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Question
Find the values of -
cos 60° × cos 30° + sin 60° × sin 30°
Sum
Solution
cos 60° × cos 30° + sin 60° × sin 30°
= `1/2 xxsqrt3/2 + sqrt3/2 xx 1/2`
= `sqrt3/4 + sqrt 3/4`
= `(sqrt3 + sqrt3)/4`
= `(2sqrt3)/4`
= `sqrt 3/2`
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Trigonometric Ratios of 30° and 60° Angles
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