4 cos 36 + cot 7 1/2=
1 . 1+ √2 +√3 +√ 4 + √5+ √6
2. 1+√2 - √3 + √4 + √5-√6
з. 1+ √2 - √3 +√4-√5+√6
4. 1-√2 + √3 -√ 4 + √5 - √6
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the answer is =6532ratio56
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