ATAN(III) 4/30/73 ATAN(III) NAME atan, atan2 - arc tangent function SYNOPSISjsrpc,atan[2]doubleatan(x)doublex;doubleatan2(x,y)doublex,y;DESCRIPTION Theatanentry returns the arc tangent of fr0 in fr0; from C, the arc tangent ofxis returned. The range is -J/2 to J/2. Theatan2entry returns the arc tangent of fr0/fr1 in fr0; from C, the arc tangent ofx/yis returned. The range is -J to . DIAGNOSTIC There is no error return. BUGS - 1 -