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Іванна06
@Іванна06
August 2022
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Знайти sin a і cos a, якщо tg a + ctg a =2
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Answers & Comments
LisacenkoVika
1. sin α = √(1-cos²α) = √(1- 4\9) = √(5\9)= √5\ 3
tg α = sin α \ cos α = √5\3 : (-2\3) = -√5\2
ctg α = 1 \ tg α = 1 \ (-√5\2) = -2\ √5 = -2√5 \ 5
2. cos α = √(1-sin²α) = √(1-1\16) = √(15\16) = √15\ 4
tg α = 1\4 : √15\4 = 1\√15 = √15\ 15
ctg α = 1 \ 1\√15 = √15
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Answers & Comments
tg α = sin α \ cos α = √5\3 : (-2\3) = -√5\2
ctg α = 1 \ tg α = 1 \ (-√5\2) = -2\ √5 = -2√5 \ 5
2. cos α = √(1-sin²α) = √(1-1\16) = √(15\16) = √15\ 4
tg α = 1\4 : √15\4 = 1\√15 = √15\ 15
ctg α = 1 \ 1\√15 = √15