$\frac{1}{1-sin\left(x\right)}+\frac{1}{1+sin\left(x\right)}\sin\left(x\right)=2sec^2\left(x\right)$
$3csc\:x\:-2\:=senx$
$\int\frac{x^2+1}{x^3+3x^2+3x+1}dx$
$\int\left(te^{t+2}\right)dt$
$\left(\frac{1}{3}\right)^{-3}$
$2x^2-28x+26\ge0$
$4x^2-10y=-10$
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