$\left(x+3\right)^5y$

$\left(5ab^2+3b\right)^3$

$\frac{\left(\sec^2x+\csc^2x\right)}{\sec^2x}=\csc^2x$

$\lim_{x\to0}\left(\frac{3x^2-4x^3}{5x+7x^3}\right)$

$\left(\left(y-x\right)^43+b\right)$

$\sin\left(x\right)^2=\frac{\tan\left(x\right)^2}{1+\tan\left(x\right)^2}$

$\left(5x^{a+1}+4\right)\left(5x^{a+1}-14\right)$