$0.25k^2+0.5k+0.25$
$\sin30+\sin45=\sin75$
$\int\frac{\tan^22x}{\sec2x}dx$
$3x-x+1$
$-14\cdot\left(14-4\right)$
$\left(22-x\right)^2$
$\int\left(\frac{1}{\left(x^2+7x-6\right)}\right)dx$
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