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40
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\int 20\mathrm{d}x
Evaluate the indefinite integral first.
20x
Find the integral of 20 using the table of common integrals rule \int a\mathrm{d}x=ax.
20\times 4-20\times 2
The definite integral is the antiderivative of the expression evaluated at the upper limit of integration minus the antiderivative evaluated at the lower limit of integration.
40
Simplify.
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Matrix
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Simultaneous equation
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Integration
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Limits
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