InterviewSolution
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InterviewSolution
| 1. |
25 ^ { \circ } = x , \text { prove that } \frac { \operatorname { tan } 155 ^ { \circ } - \operatorname { tan } 115 ^ { \circ } } { 1 + \operatorname { tan } 155 ^ { \circ } \operatorname { tan } 115 ^ { \circ } } = \frac { 1 - x ^ { 2 } } { 2 x } |
| Answer» | |