• mathslover
If $$\sin \theta + 2\sin \phi + 3\sin \Psi = 0$$ and $$\cos \theta + 2\cos \phi + 3\cos \Psi = 0$$ ; then evaluate : a) $$\cos 3\theta + 8\cos 3 \phi + 27 \cos 3\Psi$$ b) $$\sin (\phi + \psi) + 2\sin (\Psi + \theta) + 3 \sin (\theta + \psi)$$
Mathematics

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