Odpowiedzi

2010-02-07T10:33:21+01:00
Sin=1/2

z jedynki tryg:
1-(1/2)²=cos²
cos²=3/4
cos=√3/2

tg=1/2/√3/2=√3/3

ctg=3/√3=3√3/3=√3

b)

1-(4/10)²=cos²
cos²=84/100
cos=2√21/10=√21/10

tg=sin/cos=4/10*5/√21=4/2√21=2√21/21

ctg=1/tg=21/2√21
2010-02-07T11:31:20+01:00
A)
sin=1/2
1-(1/2)²=cos²
cos²=3/4
cos=√3/2
tg=1/2/√3/2=√3/3
ctg=3/√3=3√3/3=√3

b)
1-(4/10)²=cos²
cos²=84/100
cos=2√21/10=√21/10
tg=sin/cos=4/10*5/√21=4/2√21=2√21/21
ctg=1/tg=21/2√21