$cot\:a\:sen\:a\:+\:cos\:a\:=2\:cos\:a$
$6x^6-12x^4-18x^2$
$4cm\cdot7cm$
$\frac{\left(2a^2mx^2y\right)\left(6a^2nyz^2\right)}{2a^2y}$
$\lim_{x\to-5}\left(\frac{x^4+10x^2-25}{x+5}\right)$
$-\frac{1}{cos^2x}$
$-3b+12b-13b$
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