$\left(y+5\right)\left(y+6\right)$
$-2^2.3-2.3^2+\left(-2\right).3+3$
$3\left(x^2-4\right)$
$\frac{1+\text{senx}}{\cos x}+\frac{\cos x}{1+\text{senx}}=2\sec x$
$\left(a+b+c\right)^2=1$
$csc\:\left(x^2+1\right)\frac{dy}{dx}-x\:\csc\left(y\right)=0$
$12ax+8ay$
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