If $\sin x=-\frac{3}{5}$, where $\pi

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If $\sin x=-\frac{3}{5}$, where $\pi<x<\frac{3 \pi}{2}$, then $80\left(\tan ^2 x-\cos x\right)$ is equal to [JEE Main 2024, 8 Apr (Shift 1)]

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If \(\sin x=-\frac{3}{5}\), where \(\pi<x<\frac{3 \pi}{2}\), then \(80\left(\tan ^2 x-\cos x\right)\) is equal to …