Use an addition or subtraction formula to write $\frac { \tan 10 ^ { \circ } + \tan 20 ^ { \circ } } { 1 - \tan 10 ^ { \circ } \tan 20 ^ { \circ } }$ and find its exact value.

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The Answer of Use an addition or subtraction formula to write $\frac { \tan 10 ^ { \circ } + \tan 20 ^ { \circ } } { 1 - \tan 10 ^ { \circ } \tan 20 ^ { \circ } }$ and find its exact value.

Use an Addition or Subtraction Formula to Write tan⁡10∘+tan⁡20∘1−tan⁡10∘tan⁡20∘\frac { \tan 10 ^ { \circ } + \tan 20 ^ { \circ } } { 1 - \tan 10 ^ { \circ } \tan 20 ^ { \circ } }1−tan10∘tan20∘tan10∘+tan20∘​

Use an Addition or Subtraction Formula to Write $\frac { \tan 10 ^ { \circ } + \tan 20 ^ { \circ } } { 1 - \tan 10 ^ { \circ } \tan 20 ^ { \circ } }$