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Standard Values

If cos 3 θ=√3...

Question

If cos 3 $θ$ = $\sqrt{3}$ /2; 0 < $θ$ < 200, then value of $θ$ is:

A

15 degrees

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B

10 degrees

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C

0 degrees

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D

12 degrees

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Solution

The correct option is B
10 degrees

cos3 $θ$ = $\sqrt{3}$ /2 = cos $30^{\circ}$

3 $θ$ = $30^{\circ}$

$θ$ = $10^{\circ}$

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