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`        If the normal to the curve y=f (x) at the point (3, 4) makes an angle 3 p/4 with the positive x-axis then f' (3) = (A) –1                                      (B) –3/4 (C) 4/3                                `
8 years ago

8 Points
```										y =f(x)
Slope of the normal at (x,y) to the curve = -1/f'(x)
Given, -1/f'(x) = tan (3pi/4) =-1,
So, f'(3)=1.
```
8 years ago
Sudheesh Singanamalla
114 Points
```										Slope of normal to y = f(x) at (3,4) is -1/f'(3). Thus
-1 / f'(3) = tan (3∏ / 4 ) = tan(∏/2 + ∏/4) = -cot(∏/4) = -1
=> f'(3) = 1

Hope that helps :)
```
7 years ago
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