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advanced functions

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Determine approximate solutions for this equation in the interval x is all real numbers [0, 2pi), to the nearest hundredth of a radian:

cosx + 0.75 = 0

  • advanced functions -

    cosx = -.75
    the cosine is negative in II and III
    take inverse cosine of +.75, this will give you the reference angle
    for angle in II, take pi - reference angle
    for angle in III take pi + reference angle

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