$21.05-28.3$
$5-7+14-8+12+2$
$\frac{dy}{dx}\left(\frac{xy^3}{sec\left(y\right)-1}=1+y^4\right)$
$\frac{cos\left(7x\right)+cos\left(x\right)}{sin\left(7x\right)+sin\left(x\right)}$
$sec^2x\:+\:csc^2x$
$\int\frac{\left(2x\right)}{x^2}dx$
$f\left(t\right)=4t^2+t-3$
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