Why are the cos-1 and sin-1 functions not working on my calculator? The answer always comes up as a math error and I don't know why. I'm definitely inputting everything right. -
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SOLVED: Find the exact value of the real number y if it exists. Do not use a calculator: y =arccos Select the correct answer below and, if necessary; fill in the answer
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Arccos calculator - Apps on Google Play
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