2gLcos2θ/2\sqrt{2 \mathrm{gL}} \cos ^{2} \theta / 22gLcos2θ/2
2gLcosθ/2\sqrt{2 g L} \cos \theta / 22gLcosθ/2
2gLsinθ/22 \sqrt{\mathrm{gL}} \sin \theta / 22gLsinθ/2
2gLsin2θ/2\sqrt{2 \mathrm{gL}} \sin ^{2} \theta / 22gLsin2θ/2