If $\cos x = -\frac{3}{5}$ and $x$ lies in the third quadrant,find the values of the other five trigonometric functions.

Vedclass pdf generator app on play store
Vedclass iOS app on app store
Given $\cos x = -\frac{3}{5}$.
Since $\sec x = \frac{1}{\cos x}$,we have $\sec x = -\frac{5}{3}$.
Using the identity $\sin^2 x + \cos^2 x = 1$,we get $\sin^2 x = 1 - (-\frac{3}{5})^2 = 1 - \frac{9}{25} = \frac{16}{25}$.
Thus,$\sin x = \pm \frac{4}{5}$.
Since $x$ lies in the third quadrant,$\sin x$ must be negative,so $\sin x = -\frac{4}{5}$.
Consequently,$\csc x = \frac{1}{\sin x} = -\frac{5}{4}$.
Now,$\tan x = \frac{\sin x}{\cos x} = \frac{-4/5}{-3/5} = \frac{4}{3}$.
Finally,$\cot x = \frac{1}{\tan x} = \frac{3}{4}$.

Explore More

Similar Questions

$\cos \theta(\operatorname{cosec} \theta - \sec \theta) - \cot \theta =$

$\frac{{\cot^2 15^\circ - 1}}{{\cot^2 15^\circ + 1}} = $

If $\sec x + \tan x = 3, x \in (0, \frac{\pi}{2})$,then $\sin x =$

$\tan x + \frac{\cos x}{1 + \sin x} = $

If $x \sin 45^\circ \cos^2 60^\circ = \frac{\tan^2 60^\circ \csc 30^\circ}{\sec 45^\circ \cot^2 30^\circ}$,then $x = $

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo