যদি tanθ=t =t হয় তবে cos2θ কত? - Prothom Sir

যদি

\tan θ = t

=t হয় তবে

\cos 2 θ

কত?

Created: 6 months ago | Updated: 1 week ago

t - t^{2}

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

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

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

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