Bài 19 trang 84 - Tính
Lớp 9 SGK Toán tập 1

Bài 19 trang 84 - Tính

Lời giải:

a) sin x = 0,2368 ⇒ x ≈ 13o42'

b) cos x = 0,6224 ⇒ x ≈ 51o31'

c) tan x = 2,154 ⇒ x ≈ 65o6'

d) cot x = 3,251 ⇒ x ≈ 17o6'

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