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78
78.0
23.8
cos (78 degrees) = 0.20791 (rounded) cos (78 radians) = -0.85780 (rounded) cos (78 grads) = 0.33874 (rounded)
A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 78, exactly as in the question.