1. Oblicz wartości pozostałych funkcji trygonometrycznych kąta ostrego α, gdy:
a) sinα= 12/13
b) cosα= 9/41
c) tg α = 20/21
d) ctg α = 8/15
2. tozsamość jest równość wykaż:
1-cosα/sinα * 1+cosα/ cos α = tgα
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₂a)
12² + x² = 13²
144 + x² = 169
x² = 25
x=√25
sinα= 12/13
cosα= √25/13
tgα= 12/√25
ctgα= √25/12
b)
x²+9²=41²
x²+81=1681
x²=1600
x=√1600
sinα= √1600/41
cosα= 9/41
tgα= √1600/9
ctgα=9/√1600
c)
20²+21²=x²
400+441=x²
x²=841
x= √841
sinα= 20/ √841
cosα=21/ √841
tgα=20/21
ctgα=21/20
d)
15²+8²=x²
225+64=x²
x²=289
x= √289
sinα=15/ √289
cosα=8/√289
tgα= 15/8
ctgα=8/15
2.
1-cosα/sin×1+cosα/cos=ctgα
cosα/sin=tgα