If \( \cot ^{-1} 7+\cot ^{-1} 8+\cot ^{-1} 18=\theta \), then \( \cot \theta= \) (a) \( 1 / 3 \)...

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If \( \cot ^{-1} 7+\cot ^{-1} 8+\cot ^{-1} 18=\theta \), then \( \cot \theta= \)
(a) \( 1 / 3 \)
(b) 3
(c) \( 1 / 2 \)
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