Mathematics, 05.03.2021 18:00 rosehayden21

Cos $cos18 = 1 \div 4 \sqrt{10 + 2 \sqrt{5} }$
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Cos prove without using calculator show step by step calculation ​

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Another question on Mathematics

Cos $cos18 = 1 \div 4 \sqrt{10 + 2 \sqrt{5} }$
prove without using calculator
show step by step calculation