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Solve int(dx)/(4sin^(2)x+8sin 2x-3cos^(2)x)

Solvedx4sin2(x)+8sin(2x)3cos2(x)\int \frac{dx}{4\sin^2(x)+8\sin(2x)-3\cos^2(x)}

Full solution

Q. Solvedx4sin2(x)+8sin(2x)3cos2(x)\int \frac{dx}{4\sin^2(x)+8\sin(2x)-3\cos^2(x)}
  1. Simplify using trigonometric identities: We need to simplify the expression inside the integral before we can integrate. Let's start by using trigonometric identities to rewrite the terms involving sine and cosine. We know that sin(2x)=2sin(x)cos(x)\sin(2x) = 2\sin(x)\cos(x) and that sin2(x)+cos2(x)=1\sin^2(x) + \cos^2(x) = 1. We can use these identities to rewrite the integral in terms of sin(x)\sin(x) only.
  2. Express cos2(x)\cos^2(x) in terms of sin2(x)\sin^2(x): First, let's express cos2(x)\cos^2(x) in terms of sin2(x)\sin^2(x) using the Pythagorean identity: cos2(x)=1sin2(x)\cos^2(x) = 1 - \sin^2(x). Then we can substitute this into the integral.\newlineThe integral becomes:\newlinedx4sin2(x)+8sin(2x)3(1sin2(x))\int \frac{dx}{4\sin^2(x) + 8\sin(2x) - 3(1 - \sin^2(x))}\newlineSimplify the expression:\newlinedx4sin2(x)+8sin(2x)3+3sin2(x)\int \frac{dx}{4\sin^2(x) + 8\sin(2x) - 3 + 3\sin^2(x)}\newlineCombine like terms:\newlinedx7sin2(x)+8sin(2x)3\int \frac{dx}{7\sin^2(x) + 8\sin(2x) - 3}
  3. Address the term 8sin(2x)8\sin(2x): Now, let's address the term 8sin(2x)8\sin(2x). We can use the double-angle identity for sine, which we've already mentioned: sin(2x)=2sin(x)cos(x)\sin(2x) = 2\sin(x)\cos(x). Substituting this into the integral gives us:\newlinedx7sin2(x)+8(2sin(x)cos(x))3\int\frac{dx}{7\sin^2(x) + 8(2\sin(x)\cos(x)) - 3}\newlineSimplify the expression:\newlinedx7sin2(x)+16sin(x)cos(x)3\int\frac{dx}{7\sin^2(x) + 16\sin(x)\cos(x) - 3}
  4. Explore integration options: At this point, we need to find a way to integrate this expression. It's not immediately clear how to proceed, so let's try to simplify it further. One approach could be to use a substitution, but it's not obvious what substitution would work here. Another approach could be to rewrite the expression in a more familiar form, such as a sum of squares or a product of trigonometric functions. However, this expression does not lend itself easily to such simplifications. We may have made a mistake in our approach.

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