$49x^2-64f^2$
$0x\cdot1x$
$\int_0^1\frac{2}{1+x^2}\:dx$
$\int\frac{\left(8x+3\right)}{x^2-8x+26}dx$
$\int_0^{\frac{\pi}{2}}\left(3sin^2xcos^2x\right)dx$
$\int\left(t^3\left(t^4-3\right)^3\right)dx$
$1\:+\:4v\:-7v$
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