edits, new symbolics.qmd file

CwJ/integrals/ftc.jmd

@@ -413,7 +413,7 @@ So the answer to the question is
 This seems like a lot of work, and indeed it is more than is needed. The following would be more typical once the rules are learned:
 
 ```math
-\int_0^\pi 100 \sin(x) dx = -100(-\cos(x)) \big|_0^{\pi} = 100 \cos(x) \big|_{\pi}^0 = 100(1) - 100(-1) = 200.
+\int_0^\pi 100 \sin(x) dx = 100(-\cos(x)) \big|_0^{\pi} = 100 \cos(x) \big|_{\pi}^0 = 100(1) - 100(-1) = 200.
 ```
 
 ## The derivative of the integral