Application of Derivatives 1 Question 12

12. If the normal to the curve y=f(x) at the point (3,4) makes an angle 3π4 with the positive X-axis, then f(3) is equal to

(2000, 1M)

(a) -1

(b) 3/4

(c) 4/3

(d) 1

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Answer:

Correct Answer: 12. y+x1=0

Solution:

  1. Slope of tangent y=f(x) is dydx=f(x)(3,4)

Therefore, slope of normal

=1f(x)(3,4)=1f(3) But 1f(3)=tan3π41f(3)=tanπ2+π4=1f(3)=1

[given]



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