'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); tan正切值 在Rt△ABC(直角三角形)中，C=90，AB是C的对边c，BC是A的对边a，AC是B的对边b，正...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); tan的三角函数公式 半角公式 tan(/2)=sin/(1+cos)=(1-cos)/sin 倍角公式 tan2=(2tan)/(1-tan^2) 降幂公...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 8 定理 平行于三角形一边的直线和其他两边(或两边的延长线)相交，所构成的三角形与原...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 三角函数的万能公式 (1)(sin)^2+(cos)^2=1 (2)1+(tan)^2=(sec)^2 (3)1+(cot)^2=(csc)^2 证明下面两式，只...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 1比例的基本性质如果a:b=c:d,那么ad=bc 如果ad=bc,那么a:b=c:d 2 合比性质如果a/b=c/d,那么(ab)...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 1等腰直角三角形怎么求斜边 等腰直角三角形是一种特殊的三角形，具有所有三角形的性...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 1二次函数定义 定义：一般地，自变量x和因变量y之间存在如下关系：y=ax^2+bx+c(a，b，c为...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 1积化和差公式 sincos=(1/2)[sin()sin(-)] cossin=(1/2)[sin()-sin(-)] coscos=(1/2)[cos()cos(-)] sinsin=-(1/2)...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 初中数学三角函数公式整理 锐角三角函数公式 sin=的对边/斜边 cos=的邻边/斜边 tan=的对...

'); (window.slotbydup=window.slotbydup || []).push({ id: '8096091', container: s, size: '580,90', display: 'inlay-fix' });})(); 1三角函数降次公式 sin^2()=(1-cos(2))/2 cos^2()=(1+cos(2))/2 tan^2()=(1-cos(2))/(1+cos(2)) 2降次公式推...