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There is not cos2 button on a TI-83 plus. You will need to enter the cosine function and then square it. (Press the x2 button to get the squared function.)

To type cos2(90) on a TI-83 plus, for example, type:

cos(90)2

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โˆ™ 2012-09-17 19:41:52
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Q: Where is cos2 on a ti-83 plus calculator?
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