Срочно)ПОЖАЛУЙСТАААупростить1)cos 36°+sin² 18°/cos² 18°2)sin α / 2sin² α/2. Created by samatbasket. algebra-ru

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1)cos 36°+sin² 18°/cos² 18°
2)sin α / 2sin² α/2

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Матов

Verified answer

$\frac{cos36+sin^218}{cos^218}=\frac{2cos^218-1+sin^218}{cos^218}=\\ \frac{cos^218+sin^218+cos^218-1}{cos^218}=\frac{1-1+cos^218}{cos^218}=1$

$\frac{sina}{2sin^2\frac{a}{2}} = \frac{sina}{1-cosa}=ctg\frac{a}{2}$

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Verified answer

srochno ochen 1iz oksida alyuminiya massoj 4 kg poluchilialyuminij massoj 2 kgopr

pomogi pozhalujstasochinenie na temu geroj nashego vremenine pro proizvedeniyu a

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