$\int\frac{1}{4}\tan\left(x\right)dx$
$7=x+3$
$\int_0^{\frac{\pi\:}{4}}xsec^2xdx$
$\frac{\left(18x^5y^8z^4\right)}{\left(-9^3y^5z^2\right)}$
$\left(5ab+6x\right)^2$
$\cos\left(a\right)\cos\left(a-b\right)+\sin\left(a\right)\sin\left(a-b\right)$
$\left(4.7-3.5\cos\left(1.5x\right)\right)^2$
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