Find the slope of the tangent to the parametric curve c(t) = (cos t, sin t) at the point (–1/2, –V3).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.4: Plane Curves And Parametric Equations
Problem 33E
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Find the slope of the tangent to the parametric curve c(t) = (cos t, sin t) at the point (–1/2, –V3).
Transcribed Image Text:Find the slope of the tangent to the parametric curve c(t) = (cos t, sin t) at the point (–1/2, –V3).
Expert Solution
Step 1: find what equates x and what equates y

We need to find the slope of the tangent to the parametric curve c(t)=(cos t, sin t ) at the point (-1/2, -√3)

C(t)=(cos t, sin t )

x= cos t  ....(1)

y= sin t ...(2)

 

Step 2: Find dx/dt

x= cos t 

Differentiating both sides w.r.t t we get 

dx/dt = -sin t [ derivative of cos A is -sin A]

dx/dt = -y [from equation 2 [refer step 1] ] 

At point (-1/2, -√3), 

dx/dt = -(-√3) = √3

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