
Would anyone mind telling me how to solve this problem? It seems strange as my answer is $-1$.
Do I have to apply this formula, $$\frac{r'\sinθ +r\cosθ}{r'\cosθ -r\sinθ}$$ ?

Would anyone mind telling me how to solve this problem? It seems strange as my answer is $-1$.
Do I have to apply this formula, $$\frac{r'\sinθ +r\cosθ}{r'\cosθ -r\sinθ}$$ ?
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