Tan x - 12 tan x2 - 122 tan x22 - -n terms

S_n = 12^n 1 cot 12^n 1 x 2 cot 2x ...

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Chain Rule of Differentiation

tan x + 12 ...

Question

tan x + $\frac{1}{2}$ tan $\frac{x}{2}$ + $\frac{1}{2^{2}}$ tan $\frac{x}{2^{2}}$ + ...n terms

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