kąt alfa jest ostry i sin alfa = 3/4oblicz wartość wyrażenia: 2 - cos^2 alfa
sin alfa = 3/4
sin ² alfa + cos² alfa = 1
(3/4)² + cos² alfa = 1
9/16 + cos² alfa = 1
cos² alfa = 1- 9/16
cos² alfa = 7/16
2 - cos² alfa = 2 - 7/16 = 25/16 = 1 9/16
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sin alfa = 3/4
sin ² alfa + cos² alfa = 1
(3/4)² + cos² alfa = 1
9/16 + cos² alfa = 1
cos² alfa = 1- 9/16
cos² alfa = 7/16
2 - cos² alfa = 2 - 7/16 = 25/16 = 1 9/16