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Graphical Solution of Equations of the form <i>a</i>cosθ + <i>b</i>cosθ = <i>c</i>, without the aid of tables
If P and Q are the common points of this circle and line, then OP and OQ are the bounding radii for the two values of θ, supposing these angles to be traced in the usual way by a revolving radius starting from the position OX.