W ZAŁĄCZNIKU.
sinα=⅔
cos²α=1-sin²α
cos²α=1-(⅔)²
cos²α=1-4/9
cos²α=5/9
cosα=√5/9
cosα=√5 :3
tgα= sinα/cosα
⅔:√5 /3=⅔x 3/√5=6/3√5
6/3√5= 6√5/15
tgα=6√5:15
ctgα=cosα/sinα
ctgα=√5 :3/ ⅔
ctgα=√5 :3 x3/2 =√5/2
ctgα=√5/2
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sinα=⅔
cos²α=1-sin²α
cos²α=1-(⅔)²
cos²α=1-4/9
cos²α=5/9
cosα=√5/9
cosα=√5 :3
tgα= sinα/cosα
⅔:√5 /3=⅔x 3/√5=6/3√5
6/3√5= 6√5/15
tgα=6√5:15
ctgα=cosα/sinα
ctgα=√5 :3/ ⅔
ctgα=√5 :3 x3/2 =√5/2
ctgα=√5/2