إجابة:
# 9 = 4R ^ 2cos ^ 2 (ثيتا) -4r ^ 2sinthetacostheta + ص ^ 2sin ^ 2 (ثيتا) -5rsintheta + 3rcostheta = ص (sintheta (ص (sintheta-4costheta) -5) + costheta (4rcostheta + 3)) #
تفسير:
# س = rcostheta #
# ذ = rsintheta #
# 9 = (- 2 (rcostheta) + rsintheta) ^ 2-5rsintheta + 3rcostheta #
# 9 = 4R ^ 2cos ^ 2 (ثيتا) -4r ^ 2sinthetacostheta + ص ^ 2sin ^ 2 (ثيتا) -5rsintheta + 3rcostheta #
# 9 = ص (sintheta (ص (sintheta-4costheta) -5) + costheta (4rcostheta + 3)) #
