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Question Number 192624 by sciencestudentW last updated on 23/May/23

$$cos36-cos72=?$$

Answered by som(math1967) last updated on 23/May/23

$$2sin54sin18$$$$=2\times \frac{\sqrt{5}+1}{4}\times \frac{\sqrt{5}-1}{4}$$$$=2\times \frac{5-1}{16}=\frac{1}{2}$$

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