oblicz sinus, cosinus, cotangens jesli cosinus rowny jest trzy piate
/tex]
Powyzsze wartosci podane sa dla kata ostrego.
cosa = 3/5
sin²a + cos²a = 1
sin²a + (3/5)² = 1
sin²a = 1 - 9/25
sin²a = 16/25
sina = 4/5 lub sina = -4/5
tga = sina / cosa
tga = 3/5 : 4/5 = 3/5 * 5/4 = 3/4
lub
tga = 3/5 : (-4/5) = 3/5 * (5/4) = -3/4
ctga = cosa / sina
ctga = 4/5 : 3/5 = 4/5 * 5/3 = 4/3
ctga = 4/5 : 9-3/5) = 4/5 * (-5/3) = -4/3
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/tex]
Powyzsze wartosci podane sa dla kata ostrego.
cosa = 3/5
sin²a + cos²a = 1
sin²a + (3/5)² = 1
sin²a = 1 - 9/25
sin²a = 16/25
sina = 4/5 lub sina = -4/5
tga = sina / cosa
tga = 3/5 : 4/5 = 3/5 * 5/4 = 3/4
lub
tga = 3/5 : (-4/5) = 3/5 * (5/4) = -3/4
ctga = cosa / sina
ctga = 4/5 : 3/5 = 4/5 * 5/3 = 4/3
lub
ctga = 4/5 : 9-3/5) = 4/5 * (-5/3) = -4/3