If (\tan\theta = \frac{20}{21},) cosθ will be | MATH - FUNDAMENTAL TRIGONOMETRICAL | SolveeIt | Solveeit

Today, August 18

Question

If $\tan\theta = \frac{20}{21},$ cosθ will be

A

$\pm \frac{20}{41}$

B

$\pm \frac{1}{21}$

C

$\pm \frac{21}{29}$

D

$\pm \frac{20}{21}$

Answer

$\pm \frac{21}{29}$

Explanation

Solution

$\tan\theta = \frac{20}{21} \Rightarrow \cos\theta = \pm \frac{21}{29}$ .