Trigonometry
r2=16sinθ−39r^2=16\(\sin\]\theta\)-39
r2=−16rsinθ−39r^2=-16r\(\sin\]\theta\)-39
r2=16rsinθ−39r^2=16r\(\sin\]\theta\)-39
r2=16rsinθ+39r^2=16r\(\sin\]\theta\)+39