Math, Calculus

The questions says it has 2 solutions. It wants me to find what x would be if cos(x)=-.49 and it is given that x is on the scale between 0 and 2pi.

I know that cosine is the x value, and since cosime is negative in this case the two solutions need to be in the 2nd and 3rd quadrants.
Would the correct way to do this be by making a right triangle and solving the sides?

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asked by Ali
  1. what angle has a cosine = .49 ??
    cos^-1 .49 = 60.66 degrees
    so our answers are 60.66 degrees above and below the negative y axis (180 deg)
    180 - 60.66 = 119.34 degrees
    180 + 60.66 = 240.66 degrees

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    posted by Damon
  2. 0.00695

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    posted by samantha

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