$2x^2+5x=0$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{4\tan^2\left(x\right)+tanx+1}{tan^2x+5}\right)$
$\int ln\left(x^2+\frac{7}{4}\right)dx$
$2y^2-2y+1$
$\lim_{x\to+\infty}2x^3+x^2-5x+11$
$-5+2+-17$
$2senx-4\cdot cosx$
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