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tgα = 7/5 = 1,4 ⇒ α ≈ 54,5*
tgβ = 5/7 ≈ 0,7142 ⇒ β ≈ 35,5*
II trójkąt:
sin gamma = 9/15 = 0,6 ⇒ gamma ≈ 37*
cos delta = 9/15 = 0,6 ⇒ delta ≈ 53*