$sen\:x\:+\:tg\:x\:=\:sen\:2x$
$\lim_{x\to\infty}x^{7x}$
$\left(x^2-2x-1\right).\left(x+1\right)$
$cos^2\left(3x\right)-3=-2cos^2\left(3x\right)$
$-98\:-\:\left(-46\right)$
$w^3+27n^3$
$3x^2+675=0$
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