$\tan^2\left(x\right)\sec^2\left(x\right)-\sec^2\left(x\right)+1=\tan^4\left(x\right)$

$\int\left(sin\left(12x-9\right)\right)dx$

$6b^2a^2-15b^3a^3c$

$\lim_{x\to0}\left(\:\frac{\sin\left(6x\right)^2}{3x^2}\right)$

$1.3x-2.7x^2-5.4x+3$

$\left(x^2+y^2\right)\left(x+y\right)\left(x-z\right)$

$7a+\left(3a-2a+5a\right)-6b$