Solve the equation \(5\cos (6x - 20)^\circ + 3 = 7.25\), for \(0 \le x \le 180\).
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The double angle formulae are: \(\sin 2A = 2\sin A\cos A\) \(\cos 2A = {\cos ^2}A - {\sin ^2}A\) \(= 2{\cos ^2}A - 1\) \(= 1 - 2{\sin ^2}A\) Solve the equation \(5 ...
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