$x^3y^3=3$

$-4+6-2\left(-9-10\right)+5$

$\left[\left(2a-b\right)+\left(2a-c\right)\right]+\left(-4a\:+b+c\right)$

$3\:-18\:-12\:+\:5\:+\:3$

$-35y-19$

$\lim_{x\to\frac{\pi}{4}}\left(1-tan\left(x\right)\right)\cdot sec\left(2x\right)$

$\frac{9}{\left(x+1\right)^{2}}=-2$