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R=\frac{\left(a\cdot b\cdot c\right)}{4\sqrt{s\left(s-a\right)s\left(s-b\right)\left(s-c\right)}}

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\frac{Vmax \times [S]) }{Km + [S]}

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\int\sin^{-1}\left(\frac{x}{a}\right)dx=x\times\sin^{-1}\left(\frac{x}{a}\right)+\sqrt{a^2-x^2}

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