tan15=0.083526772 cot15=11.97220935 sin15=0.083236916 cos15=0.996529787
tan35=0.196932641 cot35=5.077878367
sin35=0.193221479 cos35=0.981155166
tan50=0.285149886 cot50=3.506927581
sin50=0.274219289 cos50=0.961667188
tan75=0.442580384 cot75=2.259476552
sin75=0.404714564 cos75=0.914443067