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Expression palette: Definite Integral template and ordinary derivative template
Fill in fields appropriately.
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Context Panel: Simplify≻Assuming Positive
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In some instances, Maple considers that a definite integral is made "simpler" by evaluation. Here, the evaluation could have been done with the value command under the aegis of the assumption that is positive. Without this assumption, Maple will return , that is, the "complex sign" of .
Applying the Simplify option in the Context Panel avoids the need for the commands illustrated below.
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Give the arc length integral the name .
Append the colon and press the Enter key.
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Apply the value command with the assuming option.
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