±11+cot2θ\pm \frac{1}{\sqrt{1+\cot ^{2} \theta}}±1+cot2θ1
12+cot2θ\frac{1}{\sqrt{2+\cot ^{2} \theta}}2+cot2θ1
11+cot2θ\frac{1}{\sqrt{1+\cot ^{2} \theta}}1+cot2θ1
±11−cot2θ\pm \frac{1}{\sqrt{1-\cot ^{2} \theta}}±1−cot2θ1
12−cot2θ\frac{1}{\sqrt{2-\cot ^{2} \theta}}2−cot2θ1