Convert $12 0^{\circ}$ to radians.

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Express $3 cos θ - 4 sin θ$ in the form $R cos (θ + α)$ , where $R > 0$ and $0^{\circ} < α < 9 0^{\circ}$ .
Solve the trigonometric equation $2 cos (2 x) = 1$ for $0 \leq x \leq π$ .
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Convert 120 circ to radians. | Singapore GCE O-Level