int cos left(frac{x}{16}right) cdot cos left( | vedclass

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Question

(D) Let $I = \int \cos \left(\frac{x}{16}\right) \cdot \cos \left(\frac{x}{8}\right) \cdot \cos \left(\frac{x}{4}\right) \cdot \sin \left(\frac{x}{16}

Vedclass · Accepted Answer

$\frac{-\cos \left(\frac{x}{2}\right)}{4}+c$,where $c$ is the constant of integration

Vedclass · Answer

(D) Let $I = \int \cos \left(\frac{x}{16}ight) \cdot \cos \left(\frac{x}{8}ight) \cdot \cos \left(\frac{x}{4}ight) \cdot \sin \left(\frac{x}{16}ight) dx$. Using the identity $\sin(2	heta) = 2\sin	heta \cos	heta$,we have $\sin \left(\frac{x}{16}ight) \cos \left(\frac{x}{16}ight) = \frac{1}{2} \sin \left(\frac{x}{8}ight)$. Substituting this into the integral: $I = \int \frac{1}{2} \sin \left(\frac{x}{8}ight) \cos \left(\frac{x}{8}ight) \cos \left(\frac{x}{4}ight) dx$. Using the identity again,$\sin \left(\frac{x}{8}ight) \cos \left(\frac{x}{8}ight) = \frac{1}{2} \sin \left(\frac{x}{4}ight)$. So,$I = \int \frac{1}{2} \cdot \frac{1}{2} \sin \left(\frac{x}{4}ight) \cos \left(\frac{x}{4}ight) dx = \frac{1}{4} \int \sin \left(\frac{x}{4}ight) \cos \left(\frac{x}{4}ight) dx$. Using the identity one more time,$\sin \left(\frac{x}{4}ight) \cos \left(\frac{x}{4}ight) = \frac{1}{2} \sin \left(\frac{x}{2}ight)$. Thus,$I = \frac{1}{4} \int \frac{1}{2} \sin \left(\frac{x}{2}ight) dx = \frac{1}{8} \int \sin \left(\frac{x}{2}ight) dx$. Integrating $\sin \left(\frac{x}{2}ight)$,we get $-2 \cos \left(\frac{x}{2}ight)$. $I = \frac{1}{8} \cdot (-2 \cos \left(\frac{x}{2}ight)) + c = -\frac{1}{4} \cos \left(\frac{x}{2}ight) + c$.

$\int \cos \left(\frac{x}{16}\right) \cdot \cos \left(\frac{x}{8}\right) \cdot \cos \left(\frac{x}{4}\right) \cdot \sin \left(\frac{x}{16}\right) dx=$

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