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tga = 1 / ctga
tga = 1/3
tga = sina/cosa
1/3 = sina/cosa
cosa = 3sina
sin²a + cos²a = 1
sin²a + (3sina)² = 1
sin²a + 9sin²a = 1
10sin²a = 1
sin²a = 1/10
sina = √10 / 10 lub sina = -√10 / 10
Ponieważ alfa to kąt ostry, zatem dalej tylko bierzemy pod uwage:
sina = √10 / 10
cosa = 3√10 / 10