Trigonometry
±1−cos2x1+cos2x\(\pm\]\frac{\sqrt{1-\cos^2x}\)}{1+\(\cos\)^2x}
±1−cos2x1−cos2x\(\pm\]\frac{\sqrt{1-\cos^2x}\)}{1-\(\cos\)^2x}
±1+cos2x1−cos2x\(\pm\]\frac{\sqrt{1+\cos^2x}\)}{1-\(\cos\)^2x}
±1+cos2x1+cos2x\(\pm\]\frac{\sqrt{1+\cos^2x}\)}{1+cos^2x}