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Find the Exact Value cos⁡(2tan⁡−1512)\cos \left( 2 \tan ^ { - 1 } \frac { 5 } { 12 } \right)

Question 24

Essay

Find the exact value. cos⁡(2tan⁡−1512)\cos \left( 2 \tan ^ { - 1 } \frac { 5 } { 12 } \right)

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