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11 天
三角函数相关公式整理,看千遍也不够!
tan(A/2)=√((1-cosA)/((1+cosA)) tan(A/2)=-√((1-cosA)/((1+cosA)) sinA+sinB=2sin((A+B)/2)cos((A-B)/2 cosA+cosB=2cos((A+B)/2)sin((A-B)/2) tanA+tanB=sin(A+B)/cosAcosB ...
14 天
Teithwyr sy'n mynd ar drenau heb docyn i gael dirwy
Gall pobl nawr dderbyn dirwy am fynd ar drên heb docyn, ar wasanaethau ble roedd modd prynu tocyn ar fwrdd y trên yn y ...
新浪网
17 天
康欣新材跌1.43%,成交额1069.35万元,后市是否有机会?
主要产品包括杨木复合集装箱底板、COSB 复合集装箱底板、环保板等各类优质、新型木质复合材料、装配式木结构房屋,以及速生杨种苗,石楠 ...
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