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The integrating factor of equation $$\sec^2 y \frac{dy}{dx} + x \tan y = x^3$$ is
$$[e]^{\frac{x^2}{2}}$$
$$[e]^{\frac{-x^2}{2}}$$
$$[e]^{\frac{x}{2}}$$
$$[e]^{\frac{-x}{2}}$$
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