# Thread: Trigonmetric general solutions question

1. ## Trigonmetric general solutions question

I'm not sure how to solve using general solutions $\sin{3\theta}=3\sin{\theta}$

2. ## Re: Trigonmetric general solutions question

Originally Posted by aonin
I'm not sure how to solve using general solutions $\sin{3\theta}=3\sin{\theta}$
Start by simplifying the LHS using the identity $\displaystyle \sin{3\theta} \equiv 3\sin{\theta} - 4\sin^3{\theta}$.