Application of DerivativeHard
Question
If the normal to the curve y = f (x) at the point (3, 4) makes an angle 
with the positive xaxis, then f′(3) is equal to
with the positive xaxis, then f′(3) is equal toOptions
A.-1
B.- 3/4
C.4/3
D.1
Solution
Slope of tangent y = f (x) is 
= f′(x)(3, 4)
Therefore, slope of normal
But
(given)
⇒
f′(x) = 1
= f′(x)(3, 4)Therefore, slope of normal
But
(given) ⇒
f′(x) = 1
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