Nilai limx→ π2 1−sin2x(sin 12x−cos 12x)2 =....\lim\limits_{x\rightarrow\ \frac{\pi}{2}}\ \frac{1-\sin^2x}{\left(\sin\ \frac{1}{2}x-\cos\ \frac{1}{2}x\right)^2}\ =....x→ 2πlim (sin 21x−cos 21x)21−sin2x =....
222
−2-2−2
−4-4−4
−3-3−3
444