Integration

let cos(x) = ?

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Originally Posted by Selim

let cos(x) = ?

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See this link:

integrate 1/(3+2cosx) - Wolfram|Alpha


Click on "show steps"

How did they know to do that? (Wait)

Quote:

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Originally Posted by Selim

How did they know to do that? (Wait)

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It is a standard substitution known as the Weierstrass substitution. There are logical mathematical reasons for where it comes from but which are beyond the scope of what you're learning.