tanya-wilkinson_60b8378aefe46
tanya-wilkinson_60b8378aefe46
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csc(α)(sec(α) - cos(α))= = (1/sin(α))(1/cos(α) - cos(α))= = (1/sin(α))(1 - cos²(α))/cos(α)= = sin²(α)/(cos(α)sin(α))= = sin(α)/cos(α)=tg(α)