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
Bài 20 trang 84 - Tính
Bài 22 trang 84 - So sánh
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