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max2010maxim [7]
3 years ago
10

find the values of x between 0 and 2pi where the tangent line to the graph of y=sinxcosx is horizontal.

Mathematics
1 answer:
Liono4ka [1.6K]3 years ago
8 0
  <span>y = sin x + cos x 

the tangent will be horizontal when the derivative is 0 

y ' = cos x - sin x 
0 = cos x - sin x 
sin x = cos x 
tan x = 1 
this happens when x = pi/4 or 5pi/4 

y(pi/4) = sqrt(2) / 2 + sqrt(2) / 2 = sqrt(2) 
y(5pi/4) = -sqrt(2) / 2 + -sqrt(2) / 2 = -sqrt(2) 

the two points are: (pi/4 , srqt(2)) and (5pi/4 , -srqt(2))

I hope my answer has come to your help. Thank you for posting your question here in Brainly.
</span>
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