$sen\left(x\:+\:7\:y\right)\:=\:3\:x$
$12x+4<184$
$-25x^2+4y^2-8y-50x-121=0$
$seno\left(x\right)\cdot cose\left(x\right)$
$\left(-5\right)-\left(-20\right)$
$\lim_{x\to\frac{9}{2}}\:\frac{\left(-20x\right)}{\left(9-2x\right)}$
$x^2-5xy+y^2;\:x=2;\:y=-1$
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