For the function f(x) = sinx*cosx the integral of it by u-substitution

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SUMMARY

The integral of the function f(x) = sin(x)cos(x) can be expressed as either -(cos(x))^2/2 or (sin(x))^2/2, both of which are valid representations. It is essential to include the constant of integration '+C' in the final answer. For first-year physics students, knowledge of integration techniques such as integration by parts, integration by substitution, and trigonometric substitutions is crucial for solving various problems effectively.

PREREQUISITES
  • Understanding of basic calculus concepts, including integration.
  • Familiarity with u-substitution technique in integration.
  • Knowledge of trigonometric identities and functions.
  • Experience with integration by parts.
NEXT STEPS
  • Study the u-substitution method in depth for various functions.
  • Learn about integration by parts and its applications.
  • Explore trigonometric substitutions for solving integrals involving trigonometric functions.
  • Practice solving integrals of products of trigonometric functions.
USEFUL FOR

This discussion is beneficial for first-year physics students, calculus learners, and anyone looking to enhance their integration skills, particularly in the context of trigonometric functions.

Panphobia
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For the function f(x) = sinx*cosx the integral of it by u-substitution could be -(cosx)^2/2 or (sinx)^2/2, which one is right for an assignment or would I need to state both? Also for a person taking first year physics, what kinds of integration will I need to know past, integration by parts, and integration by substitution?
 
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Panphobia said:
For the function f(x) = sinx*cosx the integral of it by u-substitution could be -(cosx)^2/2 or (sinx)^2/2, which one is right for an assignment or would I need to state both? Also for a person taking first year physics, what kinds of integration will I need to know past, integration by parts, and integration by substitution?

Since -(cosx)^2/2+1/2=(sinx)^2/2 they are both fine, as long as you remember to add the '+C' part. That sounds like enough integration tricks. Maybe trig substitutions as well.
 
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Thanks for the help Dick!
 
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