Ответы на вопрос:
Tga если: a)cosa=5/13, sina = √(1-cos²a) = √(1-(25/169)) = √(144/169) = 12/13. tga = sina/cosa = (12/13)*(13/5) = 12/5 = 2,4. б)cosa=0,6, sina = √(1-cos²a) = √(1-(36/100)) = √(64/100) = 8/10. tga = sina/cosa = (8/10)*(10/6) = 8/6 = 4/3 ≈ 1,333. в)sina=3/5, cosa = √(1-sin²a) = √(1-(9/25)) = √(16/25) = 4/5. tga = sina/cosa = (3/5)*(5/4) = 3/4 = 0,75. г)sina=0,8, cosa = √(1-sin²a) = √(1-(64/100)) = √(36/100) = 6/10. tga = sina/cosa = (8/10)*(10/6) = 8/6 = 4/3 ≈ 1,333.
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