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Solve the following algebraically for 0˚ ≤ x < 360˚: cos x = cos 2x Make sure you make a substitution for cos2x! Use the formula sheet!!?

Science & Mathematics by Anonymous 2018-05-18 11:07:30

Social Science

Solve the following algebraically for 0˚ ≤ x < 360˚: cos x = cos 2x Make sure you make a substitution for cos2x! Use the formula sheet!!?

1 answer

  • Anonymous

    No formula sheet was provided! 2cos^2(x)-cosx-1 = 0 (2cosx+1)(cosx-1) = 0 cosx = -1/2 or 1 x = 0°, 120° or 240°

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