17.  Square Roots

      To draw a square root, use sqrt: sqrt a+b + 1 over sqrt {ax sup 2 +bx+c}
is

[equation]

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}
is

[equation]

Big square roots are generally better written as something to the power ½:

[equation]

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