First slide

Trigonometric equations

Question

If $x$ is real, $\cos θ = x + \frac{1}{x}$ then

Moderate

A

$θ$ is an acute angle
B

$θ$ is right angle
C

$θ$ is an obtuse angle
D

$θ$ not exist

Solution

$\cos θ = x + \frac{1}{x}$
$\cos θ \leq 1$
$x + \frac{1}{x} \geq 2$
so no solution of $θ$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App