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The integrating factor of equation \({\sec ^2}y\frac{{dy}}{{dx}} + x\tan y = {x^3}\) is
1
\({e^{\frac{{{x^2}}}{2}}}\)
2
\({e^{ - \frac{{{x^2}}}{2}}}\)
3
\({e^{\frac{x}{2}}}\)
4
\({e^{ - \frac{x}{2}}}\)