Odpowiedź:
sin α = [tex]\frac{3}{5}[/tex]
więc
cos²α = 1 - sin²α = 1 - ( [tex]\frac{3}{5})^2 = \frac{25}{25} - \frac{9}{25} = \frac{16}{25}[/tex]
cos α = [tex]\sqrt{\frac{16}{25} } = \frac{4}{5}[/tex]
================
oraz
ctg α = cos α : sin α = [tex]\frac{4}{5} : \frac{3}{5} = \frac{4}{5} *\frac{5}{3} = \frac{4}{3}[/tex]
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Odpowiedź:
sin α = [tex]\frac{3}{5}[/tex]
więc
cos²α = 1 - sin²α = 1 - ( [tex]\frac{3}{5})^2 = \frac{25}{25} - \frac{9}{25} = \frac{16}{25}[/tex]
cos α = [tex]\sqrt{\frac{16}{25} } = \frac{4}{5}[/tex]
================
oraz
ctg α = cos α : sin α = [tex]\frac{4}{5} : \frac{3}{5} = \frac{4}{5} *\frac{5}{3} = \frac{4}{3}[/tex]
====================================
Szczegółowe wyjaśnienie: