lispdoc  results for sin 
(sin number)  Function: Return the sine of NUMBER.

Mentioned in: CLtL2  12.5.2. Trigonometric and Related Functions CLtL2  12.5.3. Branch Cuts, Principal Values, and Boundary Conditions in the Complex Plane HyperSpec  Function SIN, COS, TAN PCL  higher math Successful Lisp  chapter20  
(asin number)  Function: Return the arc sine of NUMBER.

Example:(defun airdistance (city1 city2) "The great circle distance between two cities." (let ((d (distance (xyzcoords city1) (xyzcoords city2)))) (* earthdiameter (asin (/ d 2)))))  Mentioned in: CLtL2  12.1. Precision, Contagion, and Coercion CLtL2  12.5.2. Trigonometric and Related Functions CLtL2  12.5.3. Branch Cuts, Principal Values, and Boundary Conditions in the Complex Plane HyperSpec  Function ASIN, ACOS, ATAN PCL  higher math 
By Bill Moorier 