The value of - if 2cos3-1 is

The correct option is A Given, 2 cos 3θ=1 ⇒ cos3θ=1/2 ⇒cos 3θ=cos 60^∘ ⇒θ=20^∘ . ...

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The value of $θ, i f 2 c o s 3 θ = 1$ is

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θ

2 cos 3 θ = 1

2 \sqrt{3} tan θ = 6

\frac{1 - {tan}^{2} θ}{1 + {tan}^{2} θ} = \frac{1}{2}

If 2 cos 3 $θ$ = 1 then $θ$ = ?

(a) $10^{o}$ (b) $15^{o}$ (c) $20^{o}$ (d) $30^{o}$

0^{o} < θ < 90^{o}

2 cos 3 θ = 1

Find the value of $θ$ in each of the following

(1) 2 sin 2 $θ$ = $\sqrt{3}$

(2) 2 cos 3 $θ$ = 1

(3) $\sqrt{3}$ tan 2 $θ$ - 3 = 0

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