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copying from above sin(5x) = = 16sin^5 - 20sin^3 + 5sin sin(5x) = sin^5(x) 3sin^5 - 4sin^3 + sin = 0 (3sin^2 -1)(sin^2 -1) = 0 sin^2(x) = 1/3 tan x = 1/√2 tan 2x = 2√2

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