Solution
Expression : $$tan 45^{\circ}=cot\theta$$
=> $$cot\theta=1$$
=> $$\theta=cot^{-1}(1)$$
=> $$\theta=45^\circ$$
Now, $$180^\circ = \pi^c$$
=> $$45^\circ = \pi \times \frac{45}{180}=\frac{\pi}{4}$$ radians
=> Ans - (D)
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