Question on Trig. Identities on this problem that involves converting rectangular equation to polar form for xy=16.

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x = r cos Θ
y = r sin Θ
xy = 16
(r sin Θ)(r cos Θ) = 16
r² sin Θ cos Θ = 16

From the third step to the 4th?
You apply your Sine Double Angle Identity :)

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