$1-\frac{x}{2}$
$\left(1-sinx\right)\left(1+sinx\right)=1-sin^2x$
$\frac{1}{1+\cot^2\left(x\right)}+\cos^2\left(x\right)=1$
$\frac{-6^8}{-6^5}$
$10xy+5xz$
$\int\left(x+3\right)^2\sin\left(x\right)dx$
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