$\sqrt{\left(\left(7x^2+1\right)^2+4\right)}$
$\frac{1+tan}{1-tan}$
$4x^6-7x^4+2;\:x=-1;\:$
$\int xsen\frac{1}{2}xdx$
$5x-7x+2y$
$\left(3-2i\right)\left(4-i\right)$
$7\cos\left(2x\right)=7\sin\left(x\right)^2+2$
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