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\frac \operatorname cos 70 ^ \circ \operatorname sin 20 ^ \circ %2B \frac \operatorname cos 55 ^ \circ \cdot \operatorname cosec 35 ^ \circ \operatorname tan 5 ^ \circ \cdot \operatorname tan 25 ^ \circ \cdot \operatorname tan 65 ^ \circ \cdot \operatorname tan 85 ^ \circ = 2 |
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