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'
Bài 18 trang 83 - Tính
Bài 20 trang 84 - Tính
I'm David Smith, husband and father , I love Photography,travel and nature. I'm working as a writer and blogger with experience of 5 years until now.
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