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Unit 1 Trig Help

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MathDude17:
Hey!
I'm doing a past paper and am stumped by this:
Prior to this question (in question c, which question d refers to), I proved that:
R^2=-cos(theta)

How do I simplify this equation?

S_R_K:
If you replace R with -cos(theta) you have an expression "in terms of r and theta".

So what's wrong with that?

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