Asked by Anonymous
Find all angles è between 0° and 180° satisfying the given equation.
cos è = 1/9
cos è = 1/9
Answers
Answered by
Steve
cosθ = 1/9
θ = 83.6°
That is your reference angle.
Since cosine is positive in QI and QIV, your two angles are
83.6° and (360-83.6)°
θ = 83.6°
That is your reference angle.
Since cosine is positive in QI and QIV, your two angles are
83.6° and (360-83.6)°
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