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The most helpfulsubstitutionfor evaluating theintegralusingtrigonometricsubstitution depends on the form of the expression inside the square root. Then, we rewrite the integral using the chosen substitution.To evaluate the integral using trigonometric substitution, we need to determine the appropriate substitution. For this particular integral, it appears that the question content area bottom part 1 is missing, as there are no options given.To choose the appropriate substitution, we consider theexpressioninside the square root. If it contains a difference of squares, we can choose the substitution x = a sinθ or x = a tanθ. If it contains asumordifferenceof squares, we can choose the substitution x = a secθ or x = a cosecθ.Once we have determined the substitution, we rewrite the integral using this substitution in part 2. This involves expressing the original variable (x) in terms of the newvariable(θ) and replacing dx with an expression involving dθ.To know more aboutintegralvisit:brainly.com/question/31744185#SPJ11...