4 . Let f ( x) � ln x .
( a ) Find f� ( x) .
( b ) Hence , write down the gradient of the tangent to the curve of f at ( 2 , ln 2 ) .
It is given that the equation of the normal to the curve of f at ( 2 , ln y � mx � ( ln 2 � 2 m) , where m is a constant .
2 ) is
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( c ) Find the exact value of the y -intercept of the normal to the curve of f at ( 2 , ln 2 ) .
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