帮我解下这几角个正弦值和余弦值,105度,75度,15度,10度,20度,40度,50度,70度,80度最好弄张正弦值和余弦值表,请大家尽力,
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帮我解下这几角个正弦值和余弦值,105度,75度,15度,10度,20度,40度,50度,70度,80度最好弄张正弦值和余弦值表,请大家尽力,
帮我解下这几角个正弦值和余弦值,
105度,75度,15度,10度,20度,40度,50度,70度,80度
最好弄张正弦值和余弦值表,请大家尽力,
帮我解下这几角个正弦值和余弦值,105度,75度,15度,10度,20度,40度,50度,70度,80度最好弄张正弦值和余弦值表,请大家尽力,
sin0=0
sinπ/6=1/2
sinπ/4=√2/2
sinπ/3=√3/2
sinπ/2=1
sin2/3π=sin(π-1/3π)=sin1/3π=√3/2
sin3/4π=sin(π-1/4π)=sin1/4π=√2/2
sin5/6π=sin(π-1/6π)=sin1/6π=1/2
sinπ=0
sin7/6π=sin(π+1/6π)=-sin1/6π=-1/2
cos0=1
cosπ/6=√3/2
cosπ/4=√2/2
cosπ/3=1/2
cosπ/2=0
cos2/3π=cos(π-1/3π)=cos1/3π=1/2
cos3/4π=cos(π-1/4π)=cos1/4π=√2/2
cos5/6π=cos(π-1/6π)=cos1/6π=√3/2
cosπ=-1
cos7/6π=cos(π+1/6π)=-cos1/6π=-√3/2
sin0=0
sinπ/6=1/2
sinπ/4=√2/2
sinπ/3=√3/2
sinπ/2=1
sin2/3π=√3/2
sin3/4π=√2/2
sin5/6π=1/2
sinπ=0
sin7/6π=-1/2
sin5/4π=-√2/2
sin4/3π=-√3/2
sin3/2π=-1
sin5/3π=-√3/2
sin7/4π=-√2/2
sin11/6π=-1/2
sin2π=0
cos0=1
cosπ/6=√3/2
cosπ/4=√2/2
cosπ/3=1/2
cosπ/2=0
cos2/3π=-1/2
cos3/4π=-√2/2
cos5/6π=-√3/2
cosπ=-1
cos7/6π=-√3/2
cos5/4π=-√2/2
cos4/3π=-1/2
cos3/2π=-1
cos5/3π=1/2
cos7/4π=√2/2
cos11/6π=√3/2
cos2π=1
楼主,这些常见的是要背的,如果你要推要结合三角形