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08-22-2012   #1 (permalink)
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Default Integration

Integrate
1) ln(e^2x) / x^2 dx


2)cos^2 (x/5)sin(x/5)dx


any help please? i'd like to see how u did them.
 
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08-22-2012   #2 (permalink)
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Since I feel lazy try this.
Go to wolfram alpha.com
Type in integrate (function here) into the box. It will compute the answer. Hit show steps.

ln(e^2x)=2xln(e)=2x
Second one is by subsitution of u=cosx
Or realizing the what the derivative of cos^3(x) is, messing around with the constants and applying the fundamental theorem of calculus.
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Quote:
Originally Posted by Cepheid
Since I feel lazy try this.
Go to wolfram alpha.com
Type in integrate (function here) into the box. It will compute the answer. Hit show steps.

ln(e^2x)=2xln(e)=2x
Second one is by subsitution of u=cosx
Or realizing the what the derivative of cos^3(x) is, messing around with the constants and applying the fundamental theorem of calculus.
ah thx, that site helped alot
 

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