正弦转换a+c=5b/4=5/4ac=b^2/4=1/4a,c是方程4x^2-5x+1=0两个根(4x-1)(x-1)=0x1=1/4,x2=1a=1/4,b=1或a=1,b=1/4
(a+c)/b=p a+c=5/4a^2+2ac+c^2=25/16 ac=1/4b^2ac=1/4a^2-2ac+c^2=25/16-4ac(a-c)^2=9/16a-c=3/4a=1c=1/4
