\( \frac {x^3 + x^2 + 3x}{4x} \)
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\( Let x^3 + x^2 + 3x = u \)
\( Let 4x = v \) |
\( \frac {\sin(x)}{cos(x)} \)
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\( Let \sin(x) = u \)
\( Let \cos(x) = v \) |