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\left. \begin{array} { l } { \text { he value of } \frac { 1 - \operatorname { tan } ^ { 2 } 15 ^ { \circ } } { 1 + \operatorname { tan } ^ { 2 } 15 ^ { \circ } } \text { is } } \\ { 1 } \\ { \frac { \sqrt { 3 } } { 2 } } \end{array} \right. |
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