$f=\frac{7}{5}x^{-\frac{2}{3}}+\sqrt{x}-\frac{9}{2}x^2y^2$
$\frac{25-\left(a\:+\:1\right)^2}{5+\left(a+1\right)}$
$x\:+\:.25\:+\:5\:+\:2$
$\frac{2x}{5}=16$
$\frac{a+3}{a^2+a-12}-\frac{a-4}{a^2-6a+9}$
$15x^2-11xy+2x^2$
$\sin2x=2\sin^2x$
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