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Expression : $$tan(\theta)=tan(30^\circ)tan(60^\circ)$$
=> $$tan(\theta)=\frac{1}{\sqrt{3}} \times \sqrt{3}$$
=> $$tan(\theta)=1$$
=> $$\theta=tan^{-1}(1)$$
=> $$\theta=45^\circ$$
$$\therefore$$ $$2\theta=2 \times 45=90^\circ$$
=> Ans - (C)
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