Equation of normal (non-vertical tangent) (y - y0 = (-1/f'(x0))(x - x0), f'(x0) ≠ 0)
jee-mainjee-advanced
y - y0 = (-1/f'(x0))(x - x0), f'(x0) ≠ 0
What each symbol means
| Symbol | What it stands for |
|---|---|
| y_0 | f(x_0) |
| f'(x_0) | Tangent slope (non-zero) |
When to use this
f'(x0) finite and non-zero. If f'(x0)=0, normal is vertical x=x0. If tangent vertical, normal is horizontal.