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Solve the following trigonometric equation for 7 <= x <= 9: 4cos(3x-20)=1 

 Jun 5, 2021
 #1
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4*cos(3x - 20) = 1

cos(3x - 20) = 1/4

arccos(1/4) = 3x - 20

 

Can you take it from here?

 

=^._.^=

 Jun 5, 2021
 #2
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+1

4cos(3x-20=1

cos(3x-20)=1/4

arccos(1/4)=3x-20

1.318116072 = 3x-20

1.318116072+20 = 3x

1.318116072+20/3 = x

21.31811607/3 = x

x = 7.106 

 

Did I do it right? 

Guest Jun 5, 2021
 #3
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Yay. :))

Nice job.

 

=^._.^=

catmg  Jun 5, 2021

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