PAGE/NUMPAGES三角函数公式:两角和公式 sin(A+B)=sinAcosB+cosAsinB sin(A-B)=sinAcosB-cosAsinB cos(A+B)=cosAcosB-sinAsinB cos(A-B)=cosAcosB+sinAsinB tan(A+B)=(tanA+tanB)/(1-tanAtanB) tan(A-B)=(tanA-tanB)/(1+tanAtanB) cot(A+B)=(cotAcotB-1)/(cotB+cotA)cot(A-B)=(cotAcotB+1)/(cotB-cotA)倍角公式 Sin2A=2SinA•CosA Cos2A=CosA^2-SinA^2=1-2SinA^2=2CosA^2-1tan2A=(2tanA)/(1-tanA^2)诱导公式 sin(-α)=-sinα cos(-α)=cosα sin(π/2-α)=cosα cos(π/2-α)=sinα sin(π/2+α)=cosα cos(π/2+α)=-sinα sin(π-α)=sinα cos(π-α)=-cosα sin(π+α)=-sinα cos(π+α)=-cosα tanA=sinA/cosA tan(π/2+α)=-cotα tan(π/2-α)=cotα tan(π-α)=-tanα tan(π+α)=tanα诱导公式记背诀窍:奇变偶不变,符号看象限万能公式 极限1.极限的概念(1)数列的极限:SKIPIF1<0,SKIPIF1<0(正整数),当SKIPIF1<0时,恒有SKIPIF1<0SKIPIF1<0或SKIPIF1<0SKIPIF1<0几何意义:在SKIPIF1<0之外,SKIPIF1<0至多有有限个点SKIPIF1<0(2)函数的极限SKIPIF1<0的极限:SKIPIF1<0,SKIPIF1<0,当SKIPIF1<0时,恒有SKIPIF1<0SKIPIF1<0或SKIPIF1<0SKIPIF1<0几何意义:在(SKIPIF1<0之外,SKIPIF1<0的值总在SKIPIF1<0之间。SKIPIF1<0的极限:SKIPIF1<0,SKIPIF1<0,当SKIPIF1<0时,恒有SKIPIF1<0SKIPIF1<0或SKIPIF1<0SKIPIF1<0几何意义:在SKIPIF1<0邻域内,SKIPIF1<0的值总在SKIPIF1<0之间。(3)左右极限左极限:SKIPIF1<0,SKIPIF1<0,当SKIPIF1<0时,恒有SKIPIF1<0SKIPIF1<0或SKIPIF1<0右极限:SKIPIF1<0,SKIPIF1<0,当SKIPIF1<0时,恒有SKIPIF1<0SKIPIF1<0或SKIPIF1<0极限存在的充要条件:SKIPIF1<0(4)极限的性质唯一性:若SKIPIF1<0,则SKIPIF1<0唯一保号性:若SKIPIF1<0,则在SKIPIF1<0的某邻域内SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0;SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0有界性:若SKIPIF1<0,则在SKIPIF1<0的某邻域内,SKIPIF1<0有界2.无穷小与无穷大(1)定义:以0为极限的变量称无穷小量;以SKIPIF1<0为极限的变量称无穷大量;同一极限过程中,无穷小(除0外)的倒数为无穷大;无穷大的倒数为无穷小。注意:0是无穷小量;无穷大量必是无界变量,但无界变量未必是无穷大量。例如当SKIPIF1<0时,SKIPIF1<0是无界变量,但不是无穷大量。(2)性质:有限个无穷小的和、积仍为无穷小;无穷小与有界量的积仍为无穷小;SKIPIF1<0成立的充要条件是SKIPIF1<0(SKIPIF1<0,SKIPIF1<0)(3)无穷小的比较(设SKIPIF1<0,SKIPIF1<0):若SKIPIF1<0,则称SKIPIF1<0是比SKIPIF1<0高阶的无穷小,记为SKIPIF1<0;特别SKIPIF1<0称为SKIPIF1<0的主部若SKIPIF1<0,则称SKIPIF1<0是比SKIPIF1<0低阶的无穷小;若SKIPIF1<0,则称SKIPIF1<0与SKIPIF1<0是同阶无穷小;若SKIPIF1<0,则称SKIPIF1<0与SKIPIF1<0是等价无穷小,记为SKIPIF1<0;若SKIPIF1<0,(SKIPIF1<0)则称SKIPIF1<0为SKIPIF1<0的SKIPIF1<0阶无穷小;(4)无穷大的比较:若SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,则称SKIPIF1<0是比SKIPIF1<0高阶的无穷大,记为SKIPIF1<0;特别SKIPIF1<0称为SKIPIF1<0的主部3.等价无穷小的替换若同一极限过程的无穷小量SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0存在,则SKIPIF1<0SKIPIF1<0SKIPIF1<0;SKIPIF1<0SKIPIF1<0注意:(1)无论极限过程,只要极限过程中方框内是相同的无穷小就可替换;(2)无穷小的替换一般只用在乘除情形,不用在加减情形;(3)等价无穷小的替换对复合函数的情形仍实用,即若SKIPIF1<0,SKIPIF1<0,则SKIPIF1<04.极限运算法则(设SKIPIF1<0,SKIPIF1<0)(1)SKIPIF1<0SKIPIF1<0SKIPIF1<0(2)SKIPIF1<0SKIPIF1<0SKIPIF1<0特别地,SKIPIF1<0,SKIPIF1<0SKIPIF1<0(3)SKIPIF1<0SKIPIF1<0(SKIPIF1<0)5.准则与公式(SKIPIF1<0,SKIPIF1<0)准则1:(夹逼定理)若SKIPIF1<0,则SKIPIF1<0SKIPIF1<0SKIPIF1<0准则2:(单调有界数列必有极限)若SKIPIF1<0单调,且SKIPIF1<0(SKIPIF1<0),则SKIPIF1<0存在(SKIPIF1<0收敛)准则3:(主部原则)SKIPIF1<0;SKIPIF1<0公式1:SKIPIF1<0SKIPIF1<0SKIPIF1<0公式2:SKIPIF1<0SKIPIF1<0SKIPIF1<0公式3:SKIPIF1<0,一般地,SKIPIF1<0公式4:SKIPIF1<06.几个常用极限SKIPIF1<0(1)SKIPIF1<0,SKIPIF1<0;(2)SKIPIF1<0,SKIPIF1<0;(3)SKIPIF1<0,SKIPIF1<0;(4)SKIPIF1<0;(5)SKIPIF1<0;(6)SKIPIF1<0友情提示:
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