$2cos^2x-3sen^2x=0$
$3x^2-4x+4$
$5\cdot10-4\cdot16$
$\csc^210a-\cot^210a$
$5\left(x+6\right)$
$\lim_{x\to\infty}\left(\frac{-8x^5+3x^4}{4x^2-2x^5}\right)$
$\left(4xy^3+3y^2+1\right)dx+\left(6x^2y^2+6xy+1\right)dy=0$
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