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\left. \begin array l 28 ^ \circ - \frac 2 3 \operatorname cot 58 ^ \circ \operatorname tan 32 ^ \circ \\ - \frac 5 3 \operatorname tan 13 ^ \circ \operatorname tan 47 ^ \circ \operatorname tan 45 ^ \circ \operatorname tan 53 ^ \circ \operatorname tan 77 ^ \circ = - 1 \end array \right. |
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