SOLUTION: Solve the equation in the interval [0,2\pi]. If there is more than one solution write them separated by commas. Hint: To solve this problem you will need the quadratic formula, i

Question 952161: Solve the equation in the interval [0,2\pi]. If there is more than one solution write them separated by commas.
Hint: To solve this problem you will need the quadratic formula, inverse trigonometric functions and the symmetry of the unit circle.
(cos x)^2-0.4cos x - 0.96 =0
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Solve the equation in the interval [0,2\pi].
(cos x)^2-0.4cos x - 0.96 =0
---------------
(cos + 0.8)*(cos - 1.2) = 0
cos = 1.2 Ignore.
----
cos(x) = -0.8
x = 143.13 degs
x = 216.87 degs
=================
Convert to radians is needed.

RELATED QUESTIONS
solve the equation in the interval [0,2,pi]. if there is more than one solution write... (answered by Alan3354)

Solve the equation in the interval [0,\, 2 \pi]. If there is more than one solution... (answered by Theo)

Solve the equation in the interval [0,2π] If there is more than one solution write them... (answered by MathLover1)

Find all solutions of the equation in the interval [0,2pi]. 2cos(theta) + sqrt( 2 ) =... (answered by Cromlix)

Find all solutions of the equation in the interval [0, 2pi). -4 cos x =-sin^2(x)+4... (answered by josgarithmetic)

(1 pt) Solve the following equation in the interval [0, 2pi ]. Note: Give the answer as... (answered by Fombitz)

Use a double-angle formula to simplify the equation sin(2x)+cos(x)=0,and then find all... (answered by lwsshak3)

Find all solutions of the equation in the interval [0,2pi].... (answered by lwsshak3)

Find all solutions of the equation in the interval [0,2pi) cscθ-1=0 Write your... (answered by lwsshak3)