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Hoeken op de cirkel Cosinus en sinusVergelijkingen met cosinus en sinus Los op: cos(x) = 1 2. We vinden x = ˇ 3 +k 2ˇof x = 5ˇ 3 +k 2ˇ met k geheel. ˇˇ 2 ˇ 2 3 ˇ2 5 3-1 1 0
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