Kąt α jest kątem ostrym, wiedząc, że sinα × cosα = 3/8; α∈(0stopni;90stopni) oblicz wartość wyrażenia sinα + cosα
sina * cosa = 3/8
(sina + cosa)² - 2sinacosa = 1
(sina + cosa)² - 2 * 3/8 = 1
(sina + cosa)² = 1 + 6/8
(sina + cosa)² = 14/8
sina + cosa = √(7/2)
sina + cosa = √7/√2
sina + cosa = √14 / 2
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sina * cosa = 3/8
(sina + cosa)² - 2sinacosa = 1
(sina + cosa)² - 2 * 3/8 = 1
(sina + cosa)² = 1 + 6/8
(sina + cosa)² = 14/8
sina + cosa = √(7/2)
sina + cosa = √7/√2
sina + cosa = √14 / 2