*************************************************

      option = 0  stops  program                 
      option = 1  gives  y = a*x ; z = x/a       
      option = 2  gives  z = y**(a*x)            
      option = 3  gives  z = exp(a*x)            
      option = 4  gives  z = log10(a*x)          
      option = 5  gives  z = ln(a*x)             
      option = 6  gives  z = b*cos(a*x)          
      option = 7  gives  z = b*sin(a*x)          
      option = 8  gives  z = b*sqrt(a*x)         
      option = 9  gives  (xx,yy)=ROT(d)*(x,y)    


*************************************************

      option = 6  gives  z = b*cos(a*x)          


 a = 1.000000 



 b = 1.000000 



 x = 75.000000 degree


 z =(1.000000)*cos(1.308997)

   =(1.000000)(0.258819) = 0.258819 



      option = 8  gives  z = b*sqrt(a*x)         


 a = 1.000000 



 b = 1.000000 



 x = 3.000000 


 z =(1.000000)*sqrt(3.000000)

   =(1.000000)(1.732051) = 1.732051 



      option = 1  gives  y = a*x ; z = x/a       


 a = 1.732051 



 x = 0.500000 


 y = a*x =0.866026 


 z = x/a =0.288675 

      option = 9  gives  (xx,yy)=ROT(d)*(x,y)    


 x = 0.500000 



 y = 0.866026 



 d = -30.000000 degree



 xx =(0.500000)*cos(-0.523599)-(0.866026)*sin(-0.523599)=0.866026 



 xx =(0.500000)*sin(-0.523599)+(0.866026)*cos(-0.523599)=0.500001 



      option = 3  gives  z = exp(a*x)            


 a = 1.000000 



 x = 1.000000 


 z = exp(1.000000) = 2.718282 



      option = 4  gives  z = log10(a*x)          


 a = 1.000000 



 x = 2.000000 


 z = log10(2.000000) = 0.301030 



      option = 1  gives  y = a*x ; z = x/a       


 a = 360.000000 



 x = 5.000000 


 y = a*x =1800.000000 


 z = x/a =0.013889 



      option = 5  gives  z = ln(a*x)             


 a = 1.000000 



 x = 10.000000 


 z = ln(10.000000) = 2.302585