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Zach · Q13

Trigonometry

How many solutions does

sin⁡x+sin⁡2x+sin⁡3x+⋯=tan⁡x\sin x+\sin^2x+\sin^3x+\cdots=\tan x

have for 0≤x≤2π0\le x\le2\pi?

A11
B22
C33
D44
E55
F66

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