求此不定积分
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I = ∫e^tcostdt = ∫costde^t = e^tcost - ∫e^tdcost
= e^tcost + ∫e^tsintdt = e^tcost + ∫sintde^t
= e^tcost + e^tsint - ∫e^tdsint = e^t(cost+sint) - I
2I = e^t(cost+sint) + 2C
I = (1/2)e^t(cost+sint) + C
= e^tcost + ∫e^tsintdt = e^tcost + ∫sintde^t
= e^tcost + e^tsint - ∫e^tdsint = e^t(cost+sint) - I
2I = e^t(cost+sint) + 2C
I = (1/2)e^t(cost+sint) + C
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