Trigonometrian peruskaava: esimerkki
http://opetus.tv/ Ratkaistaan cos α, kun sin α = 4/5 ja tiedetään, että α on π/2 ja π radiaanin välillä oleva kulma. Hyödynnetään ratkaisussa trigonometrian peruskaavaa sin²α + cos²α = 1.

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