[最も選択された] sec^2x tan^2x identity 113749-Is sec^2x-tan^2x=1 an identity Khắc

Tan(x y) = (tan x tan y) / (1 tan x tan y) sin(2x) = 2 sin x cos x cos(2x) = cos 2 (x) sin 2 (x) = 2 cos 2 (x) 1 = 1 2 sin 2 (x) tan(2x) = 2...