[最も欲しかった] cos(π/2-θ) 291205-Y=cos pi/2 theta Lessie Thomas

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上 tan^2 theta 1 785024-Tan^2 theta plus 1 Lessie Thomas

$\displaystyle\frac{2 \tan\theta}{1\tan^{2}\theta} = 2 \cdot \frac{\sin\theta}{\cos\theta} \cdot \cos^{2}\theta = 2 \cdot \sin\theta \cdot \...