$21:\left(-7\right)+10\cdot\left(-2\right)+9\cdot4-15\cdot3$
$\left(2cosx+1\right)\left(tanx+1\right)$
$4\:ln\:y\:=\:ln\:x+c$
$3x^2+6x-11=0$
$\frac{\left(k^2-7k+10\right)}{\left(k-2\right)}$
$\left(\frac{3x^2}{2x}\right)^4$
$\int x^3\cdot e^{-2}$
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