Help with Integral: c*Sin[ArcTan[f(t)]]

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SUMMARY

The discussion focuses on solving the integral of the function c*Sin[ArcTan[f(t)]] with respect to t, where f(t) is defined as a linear function of t. Participants emphasize the importance of understanding the relationship between sine and arctangent functions, particularly using the identity x=tan(ArcTan(x)) to simplify the expression. The conversation highlights the necessity of careful substitution and manipulation of trigonometric identities to arrive at a solution. Ultimately, the participants confirm that applying inverse sine to both the numerator and denominator is valid due to the known relationships derived from the substitutions.

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FunkyDwarf
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Hey guys,

im completely stumped on this one. I had to go through several substitutions just to get it to this stage which is uninspiriring :P

Integral wrt t of c*Sin[ArcTan[(f(t)]] where f(t) is a linear function of t

Sorry, i can't use latex to save my life :p
-G
 
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\int c*\sin{(\arctan{f(t))}} dt?
 
Remember:
x=tan(\arctan(x))=\frac{\sin(\arctan(x))}{\sqrt{1-\sin^{2}(\arctan(x)}}

Solve for sin(arctan(x))
 
Ah yeh of course, i was worried about applying inverse sin to the top and bottom equally but you sort of can because you know what sine is from the substitution and so can get cos. Thanks!
 

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