Find all solutions in radians. approximate your answers to the nearest hundredth. (let k be any integer.) cos (2x − 1) = 0.9 x=

0.73 + πk, 0.28 + πk

Explanation:

      cos (2x - 1) = 0.9

cos⁻¹[cos (2x - 1)] = cos⁻¹ 0.9

               2x - 1 = +/- 0.45

               2x      = +/- 0.45 + 1

                  x      =

                  x      = ,   x  =

                  x      = 0.73, 0.28

For ALL Solutions:

x = 0.73 + πk         and        x = 0.28 + πk

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