Cot(12c) = -1.5727
The answer is for angles measured in radians, the mathematical standard. If your angle was measured in other units you should have specified what units.
Also, you seem not to be aware but you could have obtained the answer much more easily and quickly by using the calculator that comes as part of your computer.
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23
+35 The absolute value of any number is always positive
The bond's value increased by 35%
35/60 = 35÷5/60÷5 = 7/12
12 and 35 are NOT prime numbers.