$7x+8y-42x$
$2cos^2x\:-\:sin^2x\:-\:2sinx-1=0$
$\left(6-3x\right)\left(6-3x\right)$
$\lim_{x\to2}\frac{5-x}{x-2}$
$33,3\infty\:x\:40$
$2+\frac{5}{x}\ge1$
$\frac{706.86}{3.1416}$
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