$\left(sen\:v\:-\:cos\:v\right)^2$
$15\cos^2\left(x\right)+7\cos\left(x\right)=2$
$f\left(x\right)=\frac{x^3-9x}{x+3}$
$3x^3+3^2+9x$
$x^2+12x+10=38$
$y+\left(cosx\right)y=0$
$x^4\:+\:4x^3\:+\:4x^2$
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