$\lim_{x\to-7}x^2+9x+2$

$\int\left(x\cdot\cos\left(x^2-1\right)\left(\frac{3}{5}\sin\left(x^2-1\right)-1\right)^{\frac{1}{2}}\right)dx$

$\lim_{x\to2}\left(3+2x+x^2\right)$

$24d-32d^4+4d^2$

$\left(\frac{2}{5}x^2+2y\right)\left(\frac{2}{5}x^2-2y\right)$

$y^3-12y^2+36y=0$

$x^2-8x+41$