回答:
#R = 9 /(R(+ 5costheta sintheta)^ 2-2sintheta + costheta)#
说明:
为此,我们需要:
#X = rcostheta#
#Y = rsintheta#
用这些方程代替我们:
#9 =(5rcostheta + rsintheta)^ 2-2rsintheta + rcostheta#
#9 = R ^ 2(5costheta + sintheta)^ 2-2rsintheta + rcostheta#
#9 = R(R(+ 5costheta sintheta)^ 2-2sintheta + costheta)#
#R = 9 /(R(+ 5costheta sintheta)^ 2-2sintheta + costheta)#