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\frac{11+4}{15}
Since \frac{11}{15} and \frac{4}{15} have the same denominator, add them by adding their numerators.
\frac{15}{15}
Add 11 and 4 to get 15.
1
Divide 15 by 15 to get 1.
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Simultaneous equation
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Integration
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Limits
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