Question

If $\sqrt{(1-{\cos }^2\theta ){\sec }^2\theta }=\tan \theta$

then press $1$ otherwise $0$

Answer 1

$\sqrt{(1-{\cos }^2\theta ){\sec }^2\theta }$

$=\sqrt{{\sec }^2\theta -\left({\cos }^2\theta \right)\left({\sec }^2\theta \right)}$

$=\sqrt{{\sec }^2\theta -1}=\tan \theta$