The line is perpendicular to the tangent line of the curve at some point

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

The line

y=x-4

is perpendicular to the tangent line of the curve

y=e^{x}\cos x

at some point

x=c

. Which of the following values is closest to

c

? (a)

0.79

(b)

1.04

(c)

0

(d)

1.57

Related theory

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