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How to integral the specified function with specified value in MatLab? - integral -- MatLab

 How to integral the specified function with specified value in  MatLab? - integral -- MatLab How to integral the specified function with specified value in  MatLab?  [Ans] integral [syntax] q = integral(fun,xmin,xmax) q = integral(fun,xmin,xmax,<Name_1>,<Value_1>,...,<Name_nth>,<Value_nth>) [description] ∫(<upperbound>,<lowerbound>)f(x)dx can be pronounced as  summation <f>(x) d x from <lowerbound> to <upperbound>. It can be written as  integral(<f>,<lowerbound>,<upperbound>). Name_1,Value_1 pair is used to set  that Name_1 as Value_1
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pi definition -- Math

 pi definition -- Math pi=3.14159...=4*arctan(1)=imag(log(-1)) more details on: Ratio of circle's circumference to its diameter - MATLAB pi (mathworks.com)
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arctan(x/y) v.s. arctan2(x,y) -- Math

 arctan(x/y) v.s. arctan2(x,y) -- Math arctan2(x,y) is similar to arctan(x/y) but a little difference is arctan can handle when y is equal to zero and arctan2 can handle when x is not equal to zero and y is equal to zero. more details and definition on: wiki website Atan2 - 維基百科，自由的百科全書 (wikipedia.org)
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