Slope of tangent and normal: The slope of the tangent to a continuous curve y = (x) at point p(x₁, y₁) is =
If the tangent of curve makes an angle θ with x-axis then
If tangent is parallel to x - axis then θ = 0
If it is perpendicular to x-axis (i.e. parallel to y-axis) then θ = π/2
Slope of normal at p = - = - cot θ
Equation of tangent: Tangent to the curve y = f(x) at point (x₁, y₁) pass through P and having slope
∴ The equation of tangent at (x₁, y₁) to y = f(x)
is
y - y₁ = (x - x₁)
Equation of normal to y = f(x) at (x₁, y₁) is
y - y₁ = (x - x₁)
y - y₁ = - (x - x₁)
Note:
⇒ If = ∞, Then tangent at P (x₁, y₁) is parallel to y-axis and its equation x = x₁
⇒ If = 0 then the normal at p(x₁, y₁) is parallel to y-axis and its equation is x = x₁
⇒ The equation of tangent and normal to the curve having its parametric equation x = f(t) and y = g(t) given by y - g(t) = (x - f(t))… Equation of Tangent
Equation of normal is y - g(t) = - (x - f(t))
Angle of intersection of two curves:
⇒ The angle of intersection of two curves defined to be the angle between the tangents to the two curves at their point of intersection.
⇒ Let C₁ and C₂ be two curves be 2 curves having equation y = f(x) and y = g(x) respectively. Let PPT₁ and PT₂ tangents to the curves C₁ and C₂ respectively at common point of intersection.
⇒ Then the angle between PT₁ and PT₂ is the angle of intersection of C₁ and C₂. Let θ₁ and θ₂ be angles made PT₁ and PT₂ with positive direction of x-axis in anti-clock wise sense then m₁ = tan θ₁ = slope of tangent to y = f(x) at P.
⇒ = \[{{\left( \frac{dy}{dx} \right)}_{{{C}_{1}}}}\]
⇒ m₂ = tan θ₂ = slope of tangent to y = f(x) =
⇒ The angle of intersection of two curves defined to be the angle between the tangents to the two curves at their point of intersection.
⇒ Let C₁ and C₂ be two curves be 2 curves having equation y = f(x) and y = g(x) respectively. Let PPT₁ and PT₂ tangents to the curves C₁ and C₂ respectively at common point of intersection.
⇒ Then the angle between PT₁ and PT₂ is the angle of intersection of C₁ and C₂. Let θ₁ and θ₂ be angles made PT₁ and PT₂ with positive direction of x-axis in anti-clock wise sense then m₁ = tan θ₁ = slope of tangent to y = f(x) at P.
⇒ = \[{{\left( \frac{dy}{dx} \right)}_{{{C}_{1}}}}\]
⇒ m₂ = tan θ₂ = slope of tangent to y = f(x) =
∴ Angle between tangents is tan θ =
The other angle between the tangents is 180 - θ
Generally the smaller of these two angles is taken to be the angle of intersection.
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