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Question Number 142414 by mathdanisur last updated on 31/May/21

$$4{sin}^{2}18°+2sin18°+2,5=?$$

Commented by som(math1967) last updated on 31/May/21

$$3.5$$

Commented by mathdanisur last updated on 31/May/21

$$howsir,butanswer:3,75$$

Answered by som(math1967) last updated on 31/May/21

$$4\times \frac{{(\sqrt{5}-1)}^2}{16}+2\times \frac{\sqrt{5}-1}{4}+2.5$$$$\frac{5+1-2\sqrt{5}}{4}+\frac{\sqrt{5}-1}{2}+2.5$$$$\frac{6-2\sqrt{5}+2\sqrt{5}-2}{4}+2.5$$$$1+2.5=3.5$$

Commented by mathdanisur last updated on 31/May/21

$$coolSirthanks$$

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