$-2k>18$

$6b+7b-10$

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

$\left(9w^2+25v^4\right)\left(3w+5v^2\right)\left(3w-5v^2\right)$

$\int\frac{3a^2+6a}{a^3+3a^2}da$

$\frac{d^3y}{d^3}-\left(\frac{dy}{dx}\right)^4=0$

$\frac{\left(1+x\right)^2}{\left(1-x\right)^2}$