You can evaluate functions at points. For example, my pay is a function of how many hours I work. At 5 hours I can evaluate the result.
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No. There are many functions that cannot be integrated.
Radians and degrees are two different systems for measuring the size of an angle. In radians, a full circle is 2pi radians. In degrees, a full circle is 360 degrees. If you want to evaluate an expression in both, then first simplify and evaluate the expression plugging in radian values into your trig functions. The second time, use degree values. On your calculator, you can switch modes between radians and degrees. It should give you the same answer unless you are supposed to leave it written as unevaluated trig functions or something like that. To convert from radians to degrees... radians=degrees * (pi/180)
I will evaluate all my math homework.
The word evaluate simply means 'find the value of...' For example, if asked to evaluate 23x4, the answer is 92.