### Question 14.3

I'm trying to do some simple trig, and I am #including `<math.h>`, but I keep getting ``undefined: sin'' compilation errors.

Make sure you're actually linking with the math library. For instance, under Unix, you usually need to use the `-lm` option, at the end of the command line, when compiling/linking. See also questions 13.25 and 13.26.

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