$\int27e^{3x}\cdot sin\left(3x\right)dx$
$\cos^2a\left(2+\tan^2a\right)$
$\lim_{x\to0}\left(\frac{x^2}{2-\sqrt{4+x^2}}\right)$
$4y+3b=17$
$\frac{x^{2}-28}{x-5}$
$4\sin\left(x\right)-3=-5$
$2x+6\cdot2x+6$
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