$2\cdot senx+1=3\cdot cscx$
$7-\left(5-8\right)+3-4\cdot2$
$\int e^{-.02t}dt$
$x^4-8x^2-240$
$x+4=11$
$\frac{x^5-x^3+x}{x^2+1}$
$100n^2-\:\:n+9$
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