Question

Find the value of cos 65° cos 55° cos5°.

Answer 1

It's of the form Cos(60+theta)*cos(60-theta)*cos(theta)

You can use the formula

1/4 * cos 3(theta).

Where{Theta=5}

So the answer will be 1/4*cos (15)

ANSWER::

1/4*(√3-1)/2√2

Where cos(15) is (√3-1)/2√2

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