Use a Sum or Difference Identity to Find the Exact $$\frac { \tan 70 ^ { \circ } - \tan ( - 50 ) ^ { \circ } } { 1 + \tan 70 ^ { \circ } \tan ( - 50 ) ^ { \circ } }$$

Use a sum or difference identity to find the exact value.
- $$\frac { \tan 70 ^ { \circ } - \tan ( - 50 ) ^ { \circ } } { 1 + \tan 70 ^ { \circ } \tan ( - 50 ) ^ { \circ } }$$

A) $- \frac { 1 } { 2 }$
B) $- \frac { \sqrt { 3 } } { 3 }$
C) $- 2$
D) $- \sqrt { 3 }$

Correct Answer:

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