B. TANGENTS TO A CURVE
The equation of the tangent to the curve y = f(x) at point P(x 1 , y 1 ) is
y − y 1 = f ′(x 1 )(x − x 1 ).
The equation of the tangent to the curve y = f(x) at point P(x 1 , y 1 ) is
y − y 1 = f ′(x 1 )(x − x 1 ).