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What is the value of sin(15 deg) * cos(15 deg)?

1. 1/2
2. 1/3
3. 1/4
4. 1/12

Correct answer: 1/4

Solution

By the double-angle formula, sin(15)*cos(15) = (1/2)*sin(30) = (1/2)*(1/2) = 1/4.

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