Докажите тождество
[tex] \cos^{4}(x) + \sin^{4} (x) = 1 - \frac{1}{2} \sin^{2} (2x)[/tex]
[tex] \cos^{4}(x) + \sin^{4} (x) = 1 - \frac{1}{2} \sin^{2} (2x)[/tex]
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