α jest katem ostrym i sinα = 1/3. Oblicz wartość wyrażenia 2cos^2α – sinα
2cos²α-sinα=2(1-sin²α)-sinα
2(1-1/9)-1/3=2*8/9-3/9=16/9-3/9=13/9
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2cos²α-sinα=2(1-sin²α)-sinα
2(1-1/9)-1/3=2*8/9-3/9=16/9-3/9=13/9