Add intro and pdf for lognormal
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1 LOAD(ATRIG1); to access several additional simplification rules for
2 inverse trig functions.  Together with rules already known to Macsyma, the
3 following angles are fully implemented: 0, %PI/6, %PI/4, %PI/3, and %PI/2.
4 Corresponding angles in the other three quadrants are also available.
6 Examples:
8 (C2) ASIN(SQRT(3)/2);
9                                      %PI
10 (D2)                                 ---
11                                       3
13 (C3) ACSC(2);
14                                      %PI
15 (D3)                                 ---
16                                       6