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2010-03-03T17:34:42+01:00
Tgα=3
sinα=?
cosα=?
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tgα=sinα/cosα=3
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sinα=3cosα
sin²α+cos²α=1
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(3cosα)²+cos²α=1
9cos²α+cos²α=1
10cos²α=1
cos²α=0,1
cosα=√0,1=0,3162
sinα=3cosα=3*0,3162=0,9486