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Mathematics, 10.01.2020 23:31 Cinic21

It's geometry and it is asking me to find x angel with only the length of the hypotenuse which is 13 and the length of the adjacent which is 12 but i don't know how to put cos-1(12/13) in my calculator

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It's geometry and it is asking me to find x angel with only the length of the hypotenuse which is 13...
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