$\cot\left(a\right)^2-\cos\left(a\right)^2=\cot\left(a\right)^2\cos\left(a\right)^2$

$1\cdot2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot9\cdot10\cdot11\cdot12\cdot13\cdot14\cdot15\cdot16\cdot17\cdot18\cdot19\cdot20\cdot21\cdot22\cdot23\cdot24\cdot25\cdot26\cdot27\cdot28\cdot29\cdot30$

$\left(kpu\right)^0+\left(abc\right)^2$

$20+10x+3x-4$

$\int\frac{5}{\sqrt{1-\left(x-1\right)^2}}dx$

$\frac{2sin\left(2x\right)-sin\left(4x\right)}{2sin\left(2x\right)+sin\left(4x\right)}=\tan\left(x\right)^2$

$\left(\frac{x^3y^9z^{-2}}{x^{-3}yz^4}\right)^{-2}\left(\frac{x^2y^5}{y^8}\right)$