Oblicz wartości pozostałych funkcji trygonometrycznych kąta ostrego jezeli:
tgalfa=21/20 ctgalfa=pierwiastek2/2 tgalfa=2
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tgα=21/20
ctgα=20/21
21²+20²=x²
441+44=x²
x=√881=29
sinα=21/29
cosα=20/29
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ctgα=√2/2
tg=2/√2=(2√2)/2=√2
(√2)²+2²=x²
2+4=x²
x=√6
sinα=2/√6=(2√6)/6=√6/3
cosα=√2/√6=1/√3=√3/3
------------------------------
tgα=2=2/1
ctgα=1/2
2²+1²=x²
x=√5
sinα=2/√5=(2√5)/5
cosα=1/√5=√5/5