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= 1-2.cos²α / sinα.cosα + cosα/sinα
= 1- 2.cos²α / sinα.cosα + cos²α / sinα.cosα
= 1- cos²α / sinα.cosα
= sin²α + cos²α - cos²α / sinα.cosα
= sin²α / sinα.cosα
tanα = sinα / cosα
tanα = tanα ( terbukti )