   Chapter 2.6, Problem 26E

Chapter
Section
Textbook Problem

# Use implicit differentiation to find an equation of the tangent line to the curve at the given point. sin ( x + y ) = 2 x − 2 y , ( π , π )

To determine

To find:

Equation of tangent line to the curve at a given point by using implicit differentiation.

Explanation

1) Concept:

Slope of tangent line is derivative of curve at that point. Find the derivative by using implicit differentiation and substitute given point in it. This will be the slope of tangent line. Use the equation of point slope form for the given point and the calculated slope to find the equation of tangent line.

2) Formula:

i. ddxsinx=cosx

3) Given:

sin(x+y)=2x-2y

4) Calculation:

sin(x+y)=2x-2y

Differentiate with respect to x

ddxsin(x+y)=ddx2x-2y

ddxsin(x+y)=ddx2x-ddx2y

cosx+yddxx+y=2-2dydx

cosx+y1+dydx=2-2dydx

cosx+y+cosx+ydydx=2-2dydx

Use y’ for dy/dx

cosx+y+cosx+yy'=

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