1.
(x-3)/2 = 4x/3 |*6
3(x-3)= 2* 4x
3x-9= 8x
-9= 5x
x= -1,8
2.
cosα= 2/5
1= sin²α+ cos²α
1-4/25= sin²α
sinα=√21/ 5
tgα= sinα/cos
tgαα= (√21/ 5)/ (2/5)= √21/ 2
ctgα= cosα/ sinα
ctgα= (2/5)/ (√21/ 5)= 2√21/ 21
licze na naj ;)
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1.
(x-3)/2 = 4x/3 |*6
3(x-3)= 2* 4x
3x-9= 8x
-9= 5x
x= -1,8
2.
cosα= 2/5
1= sin²α+ cos²α
1-4/25= sin²α
sinα=√21/ 5
tgα= sinα/cos
tgαα= (√21/ 5)/ (2/5)= √21/ 2
ctgα= cosα/ sinα
ctgα= (2/5)/ (√21/ 5)= 2√21/ 21
licze na naj ;)