One of the best online equation solvers available can be found on the website Wolfram Alpha. The website accepts equations and most types of query, and returns an answer with proofs.
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One might find the mathematical equation for the surface area of a sphere in a mathematics textbook. One might also find the equation at online math study groups.
There are a number of online sites which contain free math problem solvers. The web domains "Basic-Mathematics" and "Mathway," for example, are good resources.
Math can be a difficult subject for some yet easy for others. For those requiring a bit of help one could use a math solver. WebMath has a great math solver that will help solve any math problem whether it be algebra, calculus or trigonometry.
If you have two equations give AND one parametric equation why do you need to find yet another equation?
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