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

−5cosx=4

Select all correct solutions.

approximately 0.644

approximately 2.498

approximately 3.785

approximately 5.640

 Mar 31, 2020
 #1
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-5cos x  =  4

 

cos x  = (-4/5)

 

Take the  arccos

 

arccos (-4/5)  = x ≈  2.498

 

Also

 

pi - 2.498  +  pi   =

 

2pi  - 2.498  =

 

3.785

 

 

cool cool cool

 Mar 31, 2020

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