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Use an Addition or Subtraction Formula to Write tan10+tan201tan10tan20\frac { \tan 10 ^ { \circ } + \tan 20 ^ { \circ } } { 1 - \tan 10 ^ { \circ } \tan 20 ^ { \circ } }

Question 72

Essay

Use an addition or subtraction formula to write tan10+tan201tan10tan20\frac { \tan 10 ^ { \circ } + \tan 20 ^ { \circ } } { 1 - \tan 10 ^ { \circ } \tan 20 ^ { \circ } } and find its exact value.

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