$\int_0^{\frac{3}{7}}\left(\frac{21}{\sqrt{36-49x^2}}\right)dx$
$1+sin\left(\pi+x\right)\cdot cos\left(x+\frac{3\pi}{2}\right)$
$16x^4-y^4$
$-8x-4y-5x+2y$
$e^{-c}=2^{5c}$
$\left(bc-f\right)^2$
$a^2+2x+1=0$
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