$\lim_{x\to\infty\:}\left(7+\frac{1}{x}\right)$
$3x+x+1=53$
$3\sin^2\left(x\right)-2=1$
$5x^2-6x+1$
$\int\left(\frac{arcctg\left(6x\right)}{36x^2+1}\right)dx$
$sin\left(x-30\right)=-0.3$
$\left(5x+4y+10\right)dx+\left(4x-8y-10\right)dy=0$
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