Wiedzac ze cosa =3/4 oraz a jest katem ostrym oblicz wartosc sina i tga

sin²a + cos²a = 1 sin²a = 1-(3/4)² sin²a = 16/16 - 9/16 sina= √7/4tga = sina/cosa tga = √7/4 / 3/4 = √7/4 * 4/3 = √7/3

sin²α + cos²α = 1 sin²α + (3/4)² = 1 sin²α = 1-9/16=7/16 sinα = √7/4 tgα = sinα/cosα tgα = √7/4 : 3/4 = √7/4 * 4/3 = √7/3