$3\sin^2a+\sin a=0$
$\left(4b-5\right)^2$
$\lim_{x\to0}\left(\frac{tan6x}{sin2x}\right)$
$\int\left(2+x^2e^{-x}\right)dx$
$x'=senx$
$\left(4x+7\right)\left(-x-1\right)$
$\left(-15m^2-6mn+4\right).\left(-10m^2n^4\right)$
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