Bài 21 trang 84 - Tìm x
Lớp 9 SGK Toán tập 1

Bài 21 trang 84 - Tìm x

Lời giải:

a) sin x = 0,3495 ⇒ x ≈ 20o

b) cos x = 0,5427 ⇒  x ≈ 57o

c) tan x = 1,5142 ⇒  x ≈ 57o

d) cot x = 3,163 ⇒ ⇒  x ≈ 18o

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