$\int\frac{5x^2}{\left(x^2+4x+3\right)}dx$
$\int x\cdot\sqrt{258+x}dx$
$-9z^7-18z^4+27z^3$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{100-5\pi}{\cos\left(2\pi-x\right)}\right)$
$1-sec^2x=-tan^2x$
$2\left(sinx\right)^2-sinx=1$
$180\cdot25$
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