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Solve the equation on the interval [0,2π) .

−9cosx=4

Select all correct solutions.

approximately 1.111

approximately 2.031

approximately 4.252

approximately 5.173

 Apr 1, 2020
 #1
avatar+112282 
+2

-9cos (x)  =  4

 

cos (x)  =  -4/9

 

Take  the  arccos

 

arccos (-4/9) = x     =  2.031       and      2pi - 2.031  = 4.252

 

 

cool cool cool

 Apr 1, 2020

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