The radius of the circle whose arc of length $15\,cm$ makes an angle of $3/4$ radian at the centre is .....$cm$

Find the values of other five trigonometric functions if $\sin x=\frac{3}{5}, x$ lies in second quadrant.

Find the degree measures corresponding to the following radian measures (Use $\pi=\frac{22}{7}$ ).

$\frac{5 \pi}{3}$

Convert $6$ radians into degree measure.

If $x = \sec \theta + \tan \theta ,$ then $x + \frac{1}{x} = $

If $\frac{\sin ^4 x}{2}+\frac{\cos ^4 x}{3}=\frac{1}{5},$ then

$(A)$ $\tan ^2 x=\frac{2}{3}$ $(B)$ $\frac{\sin ^8 x}{8}+\frac{\cos ^8 x}{27}=\frac{1}{125}$

$(C)$ $\tan ^2 x=\frac{1}{3}$ $(D)$ $\frac{\sin ^8 x}{8}+\frac{\cos ^8 x}{27}=\frac{2}{125}$