$\frac{sin^2x}{cos^4\:x}$
$7.95+17.4j=-11.52+17.4j$
$\left(2x+5\right)^2-\left(x-1\right)^2$
$2x^2-28x+26\ge0$
$\frac{2x}{3}+2=10$
$\left|65-23\right|42$
$\int\frac{13}{x^2\left(x^2+25\right)}dx$
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