Question

8) Find 2 cos 75 cos 15 =
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Answer 1

Answer:

$\frac{1}{2}$

Step-by-step explanation:

$2 \times \cos(75) \times \cos(15)$

$= \cos(75 + 15) + \cos(75 - 15)$

$= \cos(90) + \cos(60)$

$= 0 + \frac{1}{2}$

$= \frac{1}{2}$

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