$9x^2-\frac{4}{3}+4$
$\frac{\left(-1\right)^n}{5^{n+1}}x^{2n}$
$-4=\sin^2x-5$
$csc^2x\:+csc\:x$
$\left(-400\right)^0$
$x^2+4x+4=225$
$x^2-7x=5$
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