Trigonometry
±1+cos2xcosx\(\pm\]\frac{\sqrt{1+\cos^2x}\)}{\(\cos\) x}
±cos2x−1cosx\(\pm\]\frac{\sqrt{\cos^2x-1}\)}{\(\cos\) x}
±1−cos2x1+cos2x\(\pm\]\frac{\sqrt{1-\cos^2x}\)}{1+\(\cos\)^2x}
±1−cos2xcosx\(\pm\]\frac{\sqrt{1-\cos^2x}\)}{\(\cos\) x}