$\int\frac{4}{x\left(x^2+4\right)}dx$
$1+\left(sin\left(x\right)-cos\left(x\right)\right)\left(sin\left(x\right)+cos\left(x\right)\right)$
$-3\left(x^3-x^2+2\right)\:\:$
$\lim_{x\to1}\frac{\left(6senx-1\right)}{ln\left(2e^{x-1}-1\right)}$
$\left|2-\left(-7\right)\right|$
$\sqrt{7+x^3}\cdot\sqrt{7+x^3}$
$9\cdot7+3\cdot12$
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