Question

Find the value of cos 60 cos 30 + sin 60 sin 30

Answer 1

$cos60cos30 + sin60sin30 \\ = \frac{1}{2} \times \frac{ \sqrt{3} }{2} + \frac{ \sqrt{3} }{2} \times \frac{1}{2} \\ = \frac{ \sqrt{3} }{4} + \frac{ \sqrt{3} }{4} = \frac{2 \sqrt{3} }{4} = \frac{ \sqrt{3} }{2} (ans)$

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Answer 2

Answer:

1/2×root 3/2 + 1/2×root 3/2

root3/4 + root3/4

2root 3/4

root3/2