# How do you find the exact values of costheta and tantheta when sintheta=1?

$\sin \theta = 1 \to \theta = \left(2 k + \frac{1}{2}\right) \pi , k = 0 , \pm 1 , \pm 2 , \pm 3 , \ldots$,
common to ${Q}_{1} \mathmr{and} {Q}_{2}$. Here, $\cos \theta = 0 \mathmr{and} \tan \theta$ has
infinite discontinuity. The left limit is $- \infty$ and the right limit is
$\infty$.