$15\left(-9\right)\left(-1\right)$
$cos^2x\:+\:qcos^2x\:=1$
$15x-2<58+5x$
$\lim_{x\to\infty}\:\:\frac{7}{e^x}-1$
$5x+3y=7$
$\left(\frac{m}{3}\right)-n^4$
$-\frac{1}{cosx}$
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