Given a trig ratio in letters (a/b, p/q, sin/x = cos/y), express another ratio in those letters

1. A.
   $\frac{b^2(2b^2 - a^2)}{a^2(a^2 + b^2)}$
2. B.
   $\frac{a^2(2b^2 + a^2)}{b^2(a^2 + b^2)}$
3. C.
   $\frac{a^2(2b^2 - a^2)}{b^2(a^2 + b^2)}$
4. D.
   $\frac{a^2(2b^2 + a^2)}{b^2(a^2 - b^2)}$

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1. A.
   $\frac{q^2}{p\sqrt{q^2 - p^2}}$
2. B.
   $\frac{p^2}{q\sqrt{q^2 - p^2}}$
3. C.
   $\frac{q}{p\sqrt{q^2 - p^2}}$
4. D.
   $\frac{p}{q\sqrt{q^2 - p^2}}$

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1. A.
   $\frac{x - y}{\sqrt{x^2 + y^2}}$
2. B.
   $\frac{5x - y}{3\sqrt{x^2 + y^2}}$
3. C.
   $\frac{x - y}{2\sqrt{x^2 + y^2}}$
4. D.
   $\frac{x - y}{\sqrt{3x^2 + 5y^2}}$

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