$\sec\left(x\right)-\sec\left(x\right)\sin^2\left(x\right)=\cos^2\left(x\right)$

$6f^{3}\left(f+3c+f^{3}\right)$

$\left(2x-9\right)\left(7x+1\right)$

$\frac{dy}{dx}+6y=14e^x,\:y\left(0\right)=18$

$\frac{5x^2-3}{2}\:=\frac{11}{10}x^2-\frac{7}{8}$

$17\sin\left(x\right)+8=\sin\left(x\right)$

$9b^2-6b+1$