$S=\frac{cos^3\theta\:\:-cos3\theta\:\:}{cos\theta\:\:}+\frac{sen^3\theta\:\:+sen3\theta\:\:}{sen\theta\:\:}$
$8x^2-6x-12$
$\left(8z^5s\right)^4$
$-2\sin\left(x\right)-4\cos\left(2x\right)=0$
$\left(a\:-\:b\right)\:-\:\left(b\:-\:a\right)^2$
$\int5x\cdot arctan\left(3x^2\right)dx$
$\left(x^2+3x\right)^4$
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