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

$393\cdot101$

$\frac{dy}{dx}=\frac{xy}{\sqrt{1-x^2}}$

$1+\sin\left(x\right)^2=1$

$100 x ( 4 x ^ { 2 } + 5 ) ^ { \frac { 2 } { 2 } }$

$\frac{dy}{dx}=\frac{2y\cos\left(x\right)}{\sin\left(x\right)}$

$\left(x+3\right)\left(3x^2-4x-5\right)$