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Show that the equation tanθ = sinθ can be written in the form sinθ(1 - 5cosθ) = 0?

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tanθ = sinθ
sinθ/cosθ = sinθ
sinθ = sinθ cosθ
sinθ - sinθ cosθ = 0
sinθ(1-cosθ) = 0

No idea where the 5 came from.

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