How do you solve cos x = -.8 for 0 < x < 2pi rounded to the nearest hundredth of a radian ?

1 Answer
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Apr 10, 2018

x=0.64^cx=0.64c or x=5.64^cx=5.64c

Explanation:

Find the first value by doing cos^-1(0.8)=0.64^ccos−1(0.8)=0.64c

Find the second value by doing 2Pi-0.64=5.64^c

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