$\left(4a^2\right)+\left(7\right)^2$
$\frac{2x-6}{4}-x+6$
$x^{2\:}-14x-49$
$\int2cos^43xdx$
$4x^3+24x^2+36x$
$\lim_{x\to\infty}\left(1+\frac{2e^{-x}}{e^x+e^{-x}}\right)$
$sen\left[x^3.\ln\left(y^2\right)\right]+\sqrt[3]{y^2-2y+1=e^{\left(x^2-1\right)^4}}$
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