The equation ${(a + b)^2} = 4ab\,{\sin ^2}\theta $ is possible only when
$2a = b$
$a = b$
$a = 2b$
None of these
Prove that $\cos \left(\frac{3 \pi}{4}+x\right)-\cos \left(\frac{3 \pi}{4}-x\right)=-\sqrt{2} \sin x$
The value of $\cot \frac{\pi}{24}$ is :
Find the angle in radian through which a pendulum swings if its length is $75\, cm$ and the tip describes an arc of length.
$10 \,cm$
Find the radian measures corresponding to the following degree measures:
$-47^{\circ} 30^{\prime}$
The equation ${\sec ^2}\theta = \frac{{4xy}}{{{{(x + y)}^2}}}$ is only possible when