sin 2 +cos 2 = 1. tan 2 +1 = sec 2. 1+cot 2 = csc 2. 三角函數的值 ... 倍角公式 sin2A = sin(A+A) = 2sinAcosA sin3A = sin(2A+A) = 3sinA-4sin 3 A cos2A = cos(A+A) = cos 2 A-sin2 ...
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