Question
Draw a circle with the help of a bangle. Take any point $P$ outside the circle. Construct the pair of tangents from the point $P$ to the circle.

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If $\sin\theta=\frac{12}{13},$ find the value of $\frac{\sin^2\theta-\cos^2\theta}{2\sin\theta\cos\theta}\times\frac{1}{\tan^2\theta}.$