∫421f(x)dx−∫411f(x)dx=∫abf(x)dx\displaystyle {\int_{{{4}}}^{{{21}}}}{f{{\left({x}\right)}}}{\left.{d}{x}\right.}-{\int_{{{4}}}^{{{11}}}}{f{{\left({x}\right)}}}{\left.{d}{x}\right.}={\int_{{{a}}}^{{{b}}}}{f{{\left({x}\right)}}}{\left.{d}{x}\right.}

where a=\displaystyle {a}= and b=\displaystyle {b}=

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