How much angle does the tangent at P make with y-axis?

1.	How much angle does the tangent at P make with y-axis?
A.	tan-1m2
B.	cot-1 (1 + m2)
C.	\({\sin ^{ - 1}}\left( {\frac{1}{{\sqrt {1 + {m^4}} }}} \right)\)
D.	\({\sec ^{ - 1}}\sqrt {1 + {m^4}}\)
Answer» D. \({\sec ^{ - 1}}\sqrt {1 + {m^4}}\)

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How much angle does the tangent at P make with y-axis?

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