$\left(1+\left(cosx\right)^2\right)\left(\left(cotx\right)^2+1\right)$

$89^4d+29^3d^2-69^2d^4$

$1.2\sin a-1=0$

$25a^2c^2+68acd+4b^2c^2$

$x^2+6x-4=0$

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

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