$3x^2y=x+9$

$\left(x+\sqrt{2}\right)\left(x+3\sqrt{2}\right)$

$e^{\left(x^2-7\right)^3}$

$\lim_{x\to0}\left(\left(x-lnx\right)\left(senx\right)\right)$

$a^4\cdot8a^2+15$

$\frac{dx}{dt}=ln\left(x^t\right)$

$\lim_{x\to\frac{\pi}{2}}\left(cos\left(5x\right)sec\left(3x\right)\right)$