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JEE Main 2023
Trigonometry
Trigonometric Ratio and Identites
Medium

Question

If sinx=35\sin x=-\frac{3}{5}, where π<x<3π2\pi< x <\frac{3 \pi}{2}, then 80(tan2xcosx)80\left(\tan ^2 x-\cos x\right) is equal to

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Solution

sinx=35 where π<x<3π2tanx=34,cosx=4580(tan2xcosx)=80(916+45)=80(45+6480)=109\begin{aligned} & \sin x=-\frac{3}{5} \text { where } \pi < x < \frac{3 \pi}{2} \\ & \qquad \tan x=\frac{3}{4}, \cos x=\frac{-4}{5} \\ & \therefore 80\left(\tan ^2 x-\cos x\right) \\ & =80\left(\frac{9}{16}+\frac{4}{5}\right) \\ & =80\left(\frac{45+64}{80}\right) \\ & =109 \end{aligned}

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