Find the roots of $f\left(x\right)=x\cdot x\cdot x$

$\left(\sin\left(x\right)+\cos\left(x\right)\right)^2$

$\left(1-\sin\left(x\right)-\cos\left(x\right)\right)^2$

$\frac{sec\left(t\right)-cos\left(t\right)}{sin\left(t\right)}$

$1+cot^2x$

$tan\left(x\right)csc\left(x\right)$

$\tan\left(x\right)\csc\left(x\right)$

$\frac{2+\tan^2\left(x\right)}{\sec^2\left(x\right)}-1$