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OpenStudy (anonymous):
Integral from 0 to a 2e^x(e^x+1)^3 dx = 120. Find X.
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OpenStudy (anonymous):
a = ln 3?
OpenStudy (anonymous):
Use u=e^x+1 du=e^x dx That makes your integral int 2u^3 so you have (1/2)(e^x+1)^4 evaluated from 0 to a. Evaluate it, solve for a.
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