$f\left(x\right)=\left(1-cosx\right)\left(1+senx\right)$
$\left(a+4\right)^2=a^2$
$4x^2-28x+33$
$4\:x\:-\:5\:<\:7$
$1-\cos a=\sqrt{3}\sin a$
$\log\left(8-10x-12x^2\right)=\log\left(2x-1\right)$
$\frac{10dy}{dx}+5x=20$
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