Sum
Find the values of
cos 60°× cos 30° + sin 60°× sin 30°
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Solution
cos 60°× cos 30° + sin 60°× sin 30°
= `1/2 xxsqrt3/2 + sqrt3/2 xx 1/2`
= `sqrt3/4 + sqrt 3/4`
= `(2sqrt3)/4`
= `sqrt 3/2`
Concept: Method of Using Trigonometric Table
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