a/b=3/4 b/c =15/16 find 18c²-7a²/45c²+20a²
A)1/3 B)2/5 C)3/4 D)1/4
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d/dA[A/b=3b/4c=15/16,18c^2−7c^2a^2/45+20a^2,A]
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