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+1 vote
8.2k views
in Indefinite Integral by (50.8k points)

Evaluate the integral: ∫sin 8x/√(9 + sin4x) dx

1 Answer

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by (51.9k points)
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Best answer

Suppose t = sin2 4x

dt = (2sin 4x cos 4x) x (4 dx)

As we know sin 2x = 2sin 2x cos 2x

So, dt = 4sin 8x dx

or sin 8x dx = dt/4

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