12sin44°/sin22°sin68°=12sin(2.22°)/sin22°sin68°=
=12.2sin22°cos22°/sin22°sin68°=24cos22°/sin68°=
=24cos22°/cos22°=24
(sin2α=2sinαcosα , sin (90°-α)=cosα)
12sin44°/sin22°sin68°=12sin(2.22°)/sin22°sin68°=
=12.2sin22°cos22°/sin22°sin68°=24cos22°/sin68°=
=24cos22°/cos22°=24
(sin2α=2sinαcosα , sin (90°-α)=cosα)