যদি $tanθ=t$ =t হয় তবে $cos2θ$ কত?

A $t-t^{2}$

B $\frac{2t}{1-t^{2}}$

C $\frac{2t}{1+t^{2}}$

D $\frac{1-t^{2}}{1 +t^{2}}$

Solution

Correct Answer: Option D

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