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-√3 sin 2α = -1 - cos 2α
-√3 . 2 sinα.cosα = -1 - (cos²α - sin²α)
-2√3.sinα.cosα = -1 - cos²α + sin²α
2√3.sinα.cosα = 1 + cos²α - sin²α
2√3.sinα.cosα = cos²α + (1 - sin²α)
2√3.sinα.cosα = cos²α + cos²α
2√3.sinα.cosα = 2cos²α
√3.sinα = cosα
√3 =
cosα / sinα = ctgα
Jadi jawabannya √3