$\cot^2\left(30^{\circ}\right)-\cos^2\left(30^{\circ}\right)=\cot^2\left(60^{\circ}\right)\cos^2\left(30^{\circ}\right)$
$\int_1^3\left(-3e^{4-5x}\right)dx$
$y'=-y,y\left(0\right)=3$
$-70-20-90$
$a+2=5$
$4\left(9-x\right)$
$\int20x\sec^2\left(x\right)dx$
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