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Mathematics, 02.09.2020 14:01 Meliiiii

Hard question please help. I had to repost because last time I wanted to give more points but I forgot to. If $\frac{\sin^2 3A}{\sin^2 A} - \frac{\cos^2 3A}{\cos^2 A} = 2$ find what $\cos2A$ is.

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