Practicing Success
The set of values of x satisfying the inequation $tan^2(sin^{-1}x) > 1 $, is |
[-1,1] $[-\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}}]$ $(-1, 1)- [-\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}}]$ $[-1, 1]- (-\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}})$ |
$(-1, 1)- [-\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}}]$ |
We have, $tan^2(sin^{-1}x) > 1 $ $⇒ tan^2 (sin^{-1}x)-1 > 0 $ $⇒tan(sin^{-1}x) < -1 $ or, $ tan(sin^{-1}x)>1$ $⇒ ∞ <tan (sin^{-1}x) < -1 $ or $1 < tan (sin^{-1}x) < ∞$ $⇒ -\frac{\pi}{2} < (sin^{-1}x) < -\frac{\pi}{4}$ or, $ \frac{\pi}{4} < sin^{-1} x < \frac{\pi}{2}$ $⇒ x ∈ \left(-1, -\frac{1}{\sqrt{2}}\right)$ or, $x ∈ \left(\frac{1}{\sqrt{2}}, 1\right)$ $⇒ x ∈ (-1, 1) - \left[-\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}}\right]$ |