Determine exact values using angle sum and difference identity (trig) – math.stackexchange.com

Determine exact values using angle sum and difference identity (trig) – math.stackexchange.com

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Ok so we have just learnt the basic angle sum and difference identities: $$\begin{array}{l}\cos \left( {A \pm B} \right) = \cos A\cos B \mp \sin A\sin B\\\sin \left( {A \pm B} \right) = \sin A\cos B ...

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