17.  Square Roots

      To draw a square root, use sqrt: sqrt a+b + 1 over sqrt {ax sup 2 +bx+c}
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Warning _ square roots of tall quantities look lousy, because a root-sign big enough to cover the quantity is too dark and heavy: sqrt {a sup 2 over b sub 2}
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Big square roots are generally better written as something to the power ½:

which is (a sup 2 /b sub 2 ) sup half