Aspire Faculty ID #14064 · Topic: JAMIA MILLIA ISLAMIA MCA 2019 · Just now
JAMIA MILLIA ISLAMIA MCA 2019

$\displaystyle \int \frac{d\theta}{1 - \tan\theta}$ equals:

Solution

Let $I = \int \frac{d\theta}{1 - \tan\theta}$. Multiply numerator and denominator by $\cos\theta$: $I = \int \frac{\cos\theta\,d\theta}{\cos\theta - \sin\theta}$. Let $u = \cos\theta - \sin\theta \Rightarrow du = -(\sin\theta + \cos\theta)d\theta$. Rewrite and integrate ⇒ $I = \dfrac{1}{2}\log|\cos\theta + \sin\theta| + C$.

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