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(5.4 / k) cos(kt)

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11y ago
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Q: What is the integral of -5.4 sin kt?
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Integral of 1 divided by sinx cosx?

Integral of [1/(sin x cos x) dx] (substitute sin2 x + cos2 x for 1)= Integral of [(sin2 x + cos2 x)/(sin x cos x) dx]= Integral of [sin2 x/(sin x cos x) dx] + Integral of [cos2 x/(sin x cos x) dx]= Integral of (sin x/cos x dx) + Integral of (cos x/sin x dx)= Integral of tan x dx + Integral of cot x dx= ln |sec x| + ln |sin x| + C


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What is the integral of sin x squared?

The integral of sin x2 is one of the Fresnel Integrals. It does not have a closed form solution. However, you can calculate a series solution by integrating the Taylor series, as follows: The Taylor series expansion about x = 0 for sin x is sin x = x - (x3/3!) + (x5/5!) - (x7/7!) +/- ... Substitution of x2 for x yields sinx2 = x2 - (x6/3!) + (x10/5!) - (x14/7!) +/- ... Term-wise integration, using the power rule gives {integral}sinx2 = (x3/3) - (x7/7*3!) + (x11/11*5!) - (x15/15*7!) +/- ... This is the answer. It is the Fresnel Integral S(x). There is a similar one for the integral of cos x2, called C(x). It can be written in more compact form: S(x) = (Sum from n = 1 to infinity) of (-1)n x4n+3/(4n+3)*(2n+1)! It looks better in Sigma notation, with fractions, but if you work out the first 4 terms, you will see agreement with the result for integrating the series expansion. Here is a link to Fresnel Integral on Wikipedia: http://en.wikipedia.org/wiki/Fresnel_integral Thank you for posing this question.