Before my TI graphing calculator died I used to use the 'Solver' function that allowed one to define variables then input knowns and solve for the unknown. Where do I find that
Derivative Calculator: Solve Derivatives with Wolfram | Math calculator, Online math, Calculator
Behind Wolfram|Alpha's Mathematical Induction-Based Proof Generator—Wolfram Blog
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Immediately Use Mathematica Like a Calculator
gratis - Free alternative to step-by-step-solution feature of Wolfram|Alpha Pro? - Software Recommendations Stack Exchange