$\left(1-\sin^{2}\left(x\right)\right)\csc\left(x\right)=\cos\left(x\right)\cot\left(x\right)$

$6^{\left(\left(-5\right)+\left(-7\right)\right)+1}$

$a^2b^2-2a^3b-ab3\:$

$2\left(2+1\right)$

$\left(4\sqrt{x}+2y^3\right)^4$

$\lim_{x\to\infty}\left(\frac{\log_{10}\left(\ln\left(x\right)\right)}{\log_{10}\left(\log_{10}\left(x\right)\right)}\right)$

$\frac{1\cdot\sin\left(x\right)}{\sec\left(x\right)\cdot\cos\left(x\right)^2}$