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sin²α+cos²α=1 ⇒sin²α=1-cos²α
2(1-cos²α)+7cos²α=6
2-2cos²α+7cos²α=6
5cos²α=4
cos²α=4/5
cosα=2√5/5
sin²α=1-4/5
sin²α=1/5
sinα=√5/5
tgα=sinα/cosα
tgα=√5/5 * 5/2√5 =1/2