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Questions  >>  CBSE XII  >>  Math  >>  Model Papers
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Q)

Show that $cot^{-1}7+cos^{-1}8+cot^{-1}18=cot^{-1}3$

$(a)\;cos^{-1}3\qquad(b)\;cot^{-1}3\qquad(c)\;sin^{-1}3\qquad(d)\;tan^{-1}3$

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