tan(θ) = sin(θ) / cos(θ) = y / x cot(θ) = cos(θ) / sin(θ) = x / y sec(θ) = 1 ... sin(2x) = 2sin(x)cos(x) cos(2x) = cos2 (x) – sin 2 (x) = 1 ...
確定！ 回上一頁
