$8x^4-18x^3+9x^2+4x-3$
$2\cdot\:\:cosx+secx-sen^2x\cdot\:\:secx=1$
$-2\left(3\right)^2+3$
$2x\:>\:4x+14\:$
$-x^{\left(4\right)}+2x^{\left(2\right)}+3x+2$
$cot\:2x\:=\frac{3}{4}$
$c\left(x\right)=0.004x^2+5\left(2000\right)+600$
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