- How do you know how rare crystals are?

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Integral cos(ln x) dx? What is the penguin mumbling at the end of the new Geico commercial? Explain how adaptations within a population can lead to biological fitness? ∫ dx/1+e^x? "curve is such that dy/dx=2-8(3x+4)^-0.5 The curve intersects the y-axis where y=4/3 Find the equation of the curve." please help me.?