Given three sides of a triangle, print area of this triangle.
Assume the three side a,b,c always a>0,b>0,c>0,a+b>c,b+c>a,c+a>b.
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(4%~2%:[:*/+/-0,+:) (4%~2%:[:*/+/-0,+:) 2 3 4 2.90474 (4%~2%:[:*/+/-0,+:) 3,4,5 6
17-char version if input is in
original 23-char version:
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