I tried to express it by $\sin x$ and got this:
$$3\sin x -4\sin^3x+2\sin^2x-2=0$$
But this is not going to be factorised.
I tried to express it by $\sin x$ and got this:
$$3\sin x -4\sin^3x+2\sin^2x-2=0$$
But this is not going to be factorised.
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