9.3 W TRÓJKĄCIE PROSTOKĄTNYM ABC KAT C JEST PROSTY.OBLICZ WARTOŚĆ FUNKCJI TRYGONOMICZNYCH KĄT BAC =alfa ,jeżeli
a) IACI=4,IABI=5
b)IACI=IBCI=7
c)IACI=2√2,IABI=3
d)IBCI=10,IABI=5√5
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a) IACI=4,IABI=5
z pitagorasa liczymy CB
4²+(CB)²=5²
CB²=25-16
CB=√9=3
tgα=3/4
ctgα=4/3
sinα=3/5
cosα=4/5
b)IACI=IBCI=7
czyli AB =7√2
tgα=7/7=1
ctgα=7/7=1
sinα=7/7√2=1/√2=√2/2
cosα=7/7√2=√2/2
c)IACI=2√2,IABI=3
CB liczymy z pitagorasa
(2√2)²+(CB)²=3²
(CB)²=9-8
CB=1
tgα=1/(2√2)=√2/4
ctgα=2√2/1=2√2
sinα=1/3
cosα=2√2/3 =⅔√2
d)IBCI=10,IABI=5√5
z pitagorasa AC
(AC)²+10²=(5√5)²
(AC)²=125-100
AC=√25=5
tgα=10/5=2
ctgα=5/10=½
sinα=10/(5√5)=2/√5=(2√5)/5
cosα=5/(5√5)=1/√5=√5/5
a)sin 0,6 cos 0,8 tg 0,75 ctg 4/3
b)sin=cos √2/7 tg=ctg 1
c)sin 1/3 cos 2√2/3 tg √2/4 ctg 2√2
d)sin 2√5/5 cos √5/5 tg 2 ctg0,5