ตอบ:
# 9 = ^ 4r 2cos ^ 2 (theta) -4r ^ 2sinthetacostheta + R ^ ^ 2 2sin (theta) -5rsintheta + 3rcostheta r = (sintheta (R (sintheta-4costheta) -5) + costheta (4rcostheta + 3)) #
คำอธิบาย:
# x = rcostheta #
# การ y = rsintheta #
# 9 = (- 2 (rcostheta) + rsintheta) ^ 2-5rsintheta + 3rcostheta #
# 9 = ^ 4r 2cos ^ 2 (theta) -4r ^ 2sinthetacostheta + R ^ ^ 2 2sin (theta) -5rsintheta + 3rcostheta #
# 9 r = (sintheta (R (sintheta-4costheta) -5) + costheta (4rcostheta + 3)) #
