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but example f(R)/dR1 how do u do that one. doesn't that require even more substitutions. because f(R)=1/R

Homework Statement question from early transcendentals (Edwards, penny) . chapter 12 partial differentiation problem 38 1/R = 1/R1 + 1/R2 + 1/R3 R is resistance measured in Ω R1 and R2 are 100Ω and increasing with 1Ω/s R3 are 200Ω and decreasing with 2Ω/s Is R increasing or...