Y1=2x^(2/3)+√(20-x²)-3
Y2=2x^(2/3)-√(20-x²)-3
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A Texas Instruments graphing calculator can be used as a basic calculator, a scientific calculator and a graphing calculator.
A graphing calculator is a scientific calculator with a graphing display window. Otherwise, there are no limits to the type of calculations that can be made on either of them.
Usually a graphing calculator should have all the capabilities you expect from a scientific calculator (and more, since it does the graphing). For more details, check the manual of your calculator if you already have one.
Someone can find a free online graphing calculator at Meta-Calculator. On Meta-Calculator one can find graphing, scientific, matrix, statistics, and programmer's calculators.
A graphing calculator is used to plot graphs and solve equations. Most graphing calculators are programmable so one can create customized programs.