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Тригонометрия (формулы двойного угла) (в стадии наполнения)

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Practice :: Task to Solve 41280 DIF: 1 GRP: 2

Найдите значение выражения:

\(\displaystyle \frac{4\sin56^ \circ }{\cos 28^ \circ \cdot\sin 28^\circ }=\)

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