$\left(1+cos2a\right)sec^2a=2$
$\left(3x\:+4y^5\right)\left(3x-4y^5\right)$
$\int_0^{\pi}\cos^4\left(2x\right)dx$
$\frac{y}{\sqrt{1+y^2}}dy=\frac{x}{\sqrt{1+x}^2}dx$
$3^2\:+\:2^9$
$-\left(3\right)\left(2x\right)^2\left(-\frac{3}{2}\right)$
$\left(8-10\right)\cdot\left(-2\right)$
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