Simple single variable integral calc

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SUMMARY

The discussion focuses on solving the integral ∫ e^x / (1 + e^(2x)) dx. The user identifies the substitution u = e^x, leading to du = e^x dx, which transforms the integral into ∫ du / (1 + u^2). This simplification reveals that the integral corresponds to the arctangent function, specifically arctan(u) + C. The final solution is arctan(e^x) + C, where C is the constant of integration.

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  • Understanding of basic integral calculus
  • Familiarity with substitution methods in integration
  • Knowledge of exponential functions and their properties
  • Concept of inverse trigonometric functions, specifically arctangent
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  • Study advanced techniques in integral calculus, including integration by parts
  • Learn about the properties of exponential functions and their integrals
  • Explore the derivation and applications of inverse trigonometric functions
  • Practice solving integrals involving substitutions with various functions
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Homework Statement



e^x dx
1+e^2x

Homework Equations


The Attempt at a Solution



Its the e^x and the e^2x that's tripping me up, i know that e^x is just itself but what is the rule behind e^2x?
 
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u = e^x
du= e^xdx

So then your integral is

u/(1+u^2)du

Does that look like something (think arc(something))
 
\int\frac{e^x}{1+e^{2x}}dx

u=e^x
du=e^xdx

PowerIso meant ...

\int\frac{du}{1+u^2}
 

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