- What is the derivative of the inverse tan^-1 (y/x)?

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What is the reaction between Sodium Chlorite (NaClO2) and Hydrogen Peroxide (H2O2)? a chemical equation would be appreciated? A geometric sequence begins 15, 3, 3/5, 3/25, 3/125,.... Find the common ratio r for this sequence.? additional questions in comments.? What is the answer of twice the diffence of 738 and 280 added to the quotient of 2466 and 9 is? -3/8-1/2 subtraction? In formally proving that lim x->1 (1/9x-1)=-8/9, let ε>0 be arbitrary. Determine δ as a function of ε. please write epsilon for ε for answer?