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Use a Sum or Difference Identity to Find the Exact tan⁡65∘+tan⁡85∘1−tan⁡65∘tan⁡85∘\frac { \tan 65 ^ { \circ } + \tan 85 ^ { \circ } } { 1 - \tan 65 ^ { \circ } \tan 85 ^ { \circ } }

Question 94

Multiple Choice

Use a sum or difference identity to find the exact value.
- tan⁡65∘+tan⁡85∘1−tan⁡65∘tan⁡85∘\frac { \tan 65 ^ { \circ } + \tan 85 ^ { \circ } } { 1 - \tan 65 ^ { \circ } \tan 85 ^ { \circ } }


A) −12- \frac { 1 } { 2 }
B) −33- \frac { \sqrt { 3 } } { 3 }
C) −2- 2
D) −3- \sqrt { 3 }

Correct Answer:

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