It is exactly 79.
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Representing a number in decimal form does not change its value. Its value remains at 79 however it it written.
cos(79) = 0.1908, approx.
Any full number could be expressed over 1, so 79= 79/1. To make it another value, you could multiply both the top and bottom by the same value. For example, 79/1*2 = 158/2.
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 decimal representation of 79 is 79, exactly as in the question.
79 + 79 = 158