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Use P=(-1,0) and the unit-circle definitions to complete the question
Which coordinate definition should be used first?
Read cosine from the horizontal coordinate and sine from the vertical coordinate
Read cosine from the vertical coordinate and sine from the horizontal coordinate
Complete the unit-circle table
For a value containing a square root, use the canonical form (P ± Q√R)/S. Enter Q with the sign of the radical term and enter its labelled coefficients