389, 390, 391

ա)

AC² = AB² — CB² = 289 — 64 = 225

AC = √225 = 15

sinA = 8/17

cosA = 15/17

tgA = 8/15

sinB = 15/17

cosB = 8/17

tgB = 15/8

բ)

AB² = AC² + CB² = 400 + 441 = 841

AB = √841 = 29

sinA = 21/29

cosA = 20/29

tgA = 21/20

sinB = 20/29

cosB = 21/29

tgB = 20/21

գ)

AB² = AC² + CB² = 4 + 1 = 5

AB = √5

sinA = 1/√5 = √5/5

cosA = 2/√5 = √10/5

tgA = 1/2

sinB = 2/√5 = √10/5

cosB = 1/√5 = √5/5

tgB = 2/1

դ)

CB2 = AB2 — AC2 = 625 — 576 = 49

CB = √49 = 7

sinA = 7/25

cosA = 24/25

tgA = 7/24

sinB = 24/25

cosB = 7/25

tgB = 24/7

ա)

tg∝ = 1/2 = AC/BC

բ)

tg∝ = 3/4 = AC/BC

գ)

cos∝ = 0,2

դ) cos∝ = 2/3

ե) sin∝ = 1/2

զ) sin∝ = 0,4

ա)

բ

գ

դ