$\large \int \frac {\cos x}{\cos(x-a)} \normalsize dx=A\;x+B\;log \cos(x-\alpha),then$ $$(a)\;A=\cos \alpha \qquad (b)\;B=\sin \alpha \qquad(c)\;A=\sin \alpha \qquad(d)\;B=\cos \alpha$$

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