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Pytanie:
Oblicz wartość pozostałych funkcji trygonometrycznych kąta ostrego , wiedząc że ctg =
ctg =5/12
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odp w załączniku :)
ctg x = 5/12
tgx = 1 / ctgx = 1 / (5/12) = 1 : 5/12 = 1 * 12/5 = 12/5
tgx = sinx / cosx
12 / 5 = sinx / cosx
5sinx = 12cosx
sinx = 12/5 cosx
sin²x + cos²x = 1
(12/5 cosx)² + cos²x = 1
144/25 cos²x + 25/25cos²x = 1
169/25cos²x = 1
cos²x = 1 : 169/25
cos²x = 25/169
cosx = √25/169
cosx =5/13
sinx = 12/5 cosx
sinx = 12/5 * 5/13
sinx = 12/13