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2009-12-10T00:26:00+01:00
A) AC = 3; BC = 1
AB = c
c² = 3² + 1² = 9 + 1 = 10
c = √10
sin α = 1/√10 = √10/10
cos α = 3/√10 = (3√10)/10
tg α = 1/3
ctg α = 3/1 = 3
b) AC = BC = 7
AB = c
c² = 7² + 7² = 2*49
c = 7 √2
sin α = 7/(7√2) = 1/√2 = √2/2
cos α = √2/2
tg α = 7/7 = 1
ctg α = 7/7 = 1
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