Cos(3π + α) = Cos(π + α) = - Cosα
- Cosα = - (- 0,28) = 0,28
cos(3π+α)=cos(π+α)=-cosα=-(cos²(α/2)-sin²(a/2/))=-cos²(α/2)+1-cos²(α/2)=1-2cos²(α/2)=1-2(-3/5)²=1-18/25=7/25
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Cos(3π + α) = Cos(π + α) = - Cosα
- Cosα = - (- 0,28) = 0,28
Verified answer
cos(3π+α)=cos(π+α)=-cosα=-(cos²(α/2)-sin²(a/2/))=-cos²(α/2)+1-cos²(α/2)=1-2cos²(α/2)=1-2(-3/5)²=1-18/25=7/25