hi my name is john.i just purchased maple last night and can't figure out how to use it can somebody help me do this questions using maple?this are the questions.i need to evaluate this four question.thanks! > int(x/(x^4+9), x = -infinity .. infinity); > int(1/(x-8)^2/3 ,x= -infinity..0); > int(x/sqrt(4-x^2), x= -2..0); > int(1/1-cos(x), x= 0..Pi);