In a triangle ABC, \angle ABC=75\textdegree and \angle ACB=\frac{\pi^{c}}{4}. The circular measure of \angle BAC is:
[A] \frac{\pi}{6}Radian
[B] \frac{\pi}{2}Radian
[C] \frac{5\pi}{12}Radian
[D] \frac{\pi}{3}Radian
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