Show that 4Cos 9=√3+√5 +√5-√5
anyone can help me...please....
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hsidodjdnddete s and may be removed tbebebehhwj
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Step-by-step explanation:
This problem can also be done using Algebra and if you remember the value of cos 18° etc. Else another way to derive this answer is by just remembering the value of sin18°
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