If $\tan \theta = \frac{{20}}{{21}},$ cos$\theta$ will be
$ \pm \frac{{20}}{{41}}$
$ \pm \frac{1}{{21}}$
$ \pm \frac{{21}}{{29}}$
$ \pm \frac{{20}}{{21}}$
If $\tan \theta + \sec \theta = {e^x},$ then $\cos \theta $ equals
Find the value of the trigonometric function $\tan \frac{19 \pi}{3}$.
The angle subtended at the centre of a circle of radius $3$ metres by an arc of length $1$ metre is equal to
Find the angle in radian through which a pendulum swings if its length is $75\, cm$ and the tip describes an arc of length.
$21\,cm$
Find the values of other five trigonometric functions if $\cot x=\frac{3}{4}, x$ lies in third quadrant.