F'(x)=sin((pi (e^x)) /2) and f(0)=1

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SUMMARY

The discussion centers on the derivative function f'(x)=sin((pi (e^x)) /2) with the initial condition f(0)=1, and the challenge of finding f(2). Users attempted integration but faced difficulties in obtaining the correct answer from the provided options. The consensus suggests using numerical integration methods, specifically Euler's method, and approximating the function using the Taylor series expansion around zero for better accuracy. The approximate value derived from the third derivative is -0.290, which helps eliminate incorrect answer choices.

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  • Knowledge of numerical methods, particularly Euler's method.
  • Basic proficiency in using mathematical software or calculators for numerical integration.
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f'(x)=sin((pi (e^x)) /2) and f(0)=1 then f(2)= ?

so i integrate and get -(1/((pi/2)*e^x)) cos((pi (e^x)) /2)+ 1=1

when i plug two into that i don't get any of the answers listed

a)-1.819
b) -.843
c.) -.819
d) .157
e) 1.157
 
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Are you supposed to do this analytically? Because I can't really find a primitive function for sin(pi e^x / 2). I can do the integration numerically though, and get one of the listed answers.
 


What he said. Your "integrate" is incorrect. Instead of finding an exact formula, can you tell by looking at the sign and approximate size of the RHS that all but one of the answers is ruled out?
 


If you have a calculator (which I can assume by the answer choices), try Euler's method.
 

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