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Q)

Evaluate : $\tan^{-1} (1) + cos^{-1} ( \frac{-1}{2} )+ \sin^{-1} (\frac{-1}{2})$


$(A)\;\frac{3 \pi}{2}$
$(B)\; \frac{3 \pi}{4} $
$(C)\;- \frac{3 \pi}{4}$
$(D)\;- \frac{3 \pi }{2}$

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