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-% These problems require arguments
-
-% Arguments: #1->a_2, #2->a_1 and #3->a_0
-% (Arguments must be integers)
-\newcount\ctr
-\newproblem[3]{diff:quad}{%
-\(f(x) =
-\ifnum#1=0
-\else
-\ifnum#1=1\else#1\fi x^2
-\fi
-\ifnum#2=0
-\else
-\ifnum#2>0 \ifnum#1=0 \else + \fi \fi
-\ifnum#2=1\else#2\fi x
-\fi
-\ifnum#3=0
-\else
-\ifnum#3>0 \ifnum#2=0 \ifnum#1=0 \else + \fi \else + \fi\fi
-#3
-\fi\)
-}{%
-\(f'(x) =
-\ifnum#1=0
-\else
-\ctr=2
-\multiply\ctr by #1
-\the\ctr x
-\fi
-\ifnum#2=0
-\else
-\ifnum#2>0 \ifnum#1=0 \else + \fi \fi
-#2
-\fi
-% print 0 if both #1 and #2 are 0
-\ifnum#1=0 \ifnum#2=0 0 \fi\fi
-\)
-}
-
-\newproblem[1]{diff:sin}{%
-\(f(x) = \sin(#1x)\)
-}{%
-\(f'(x) = #1\cos(#1x)\)
-}
-