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16 November, 08:37

Solve for 0-360 degrees.

2cos^2x + cosx = 0

+2
Answers (1)
  1. 16 November, 09:00
    0
    60, 90, 270, 300 degrees

    Step-by-step explanation:

    a = cos (x)

    2 (a^2) + a = 0

    a (2a + 1) = 0

    a = 0 OR 1/2

    so ...

    cos (x) = 0 OR cos (x) = 1/2

    x = 90 or 270 OR x = 60 or 300
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