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Improved User experience with Bonus coins.
ALL OUR MATH APPS ARE NOW 100% FREE:
★ d/dx and ƒ'(x) notation
★ Greatest and least values
★ Application of Greatest and least values
★ Maxima and minima
★ Maxima and minima problems
★ Curve sketching
★ Second derivative
★ Stationary points and the second derivative test
★ Small changes
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