If $1 + \cot \theta = {\rm{cosec}}\theta $, then the general value of $\theta $ is
$n\pi + \frac{\pi }{2}$
$2n\pi - \frac{\pi }{2}$
$2n\pi + \frac{\pi }{2}$
None of these
If $\cos \theta = - \frac{1}{{\sqrt 2 }}$ and $\tan \theta = 1$, then the general value of $\theta $ is
The total number of solution of $sin^4x + cos^4x = sinx\, cosx$ in $[0, 2\pi ]$ is equal to
If $\tan \theta + \tan 2\theta + \tan 3\theta = \tan \theta \tan 2\theta \tan 3\theta $, then the general value of $\theta $ is
Number of principal solution of the equation $tan \,3x - tan \,2x - tan\, x = 0$, is
Number of values of $x$ satisfying $2sin^22x = 2cos^28x + cos10x$ in $x \in \left[ { - \frac{\pi }{4},\frac{\pi }{4}} \right]$ is-