GRE考试只相当于大陆高中数学的水平,对中国大陆考生来说并不困难,甚至可以说是非常提分的一个科目。不过,为了避免不必要的失分,我们仍然要做好GRE考试复习,GRE数学栏目为大家整理了GRE数学常用公式,希望大家对照复习。
1、诱导公式
sin=-sin cos=cos sin=cos cos=sin
sin=cos cos=-sin sin=sin cos=-cos
sin=-sin cos=-cos tgA=tanA=sinA/cosA
2、两角和与差的三角函数
sin=sincos+cossin cos=coscos-sinsin sin=sincos-cossin cos=coscos+sinsin
tan=+tan)/tan) tan=-tan)/tan)
3、三角函数和差化积公式
sin+sin=2sin/2)cos/2) sinsin=2cos/2)sin/2)
cos+cos=2cos/2)cos/2) cos-cos=-2sin/2)sin/2)
4、积化和差公式
sinsin=-1/2 coscos=1/2
sincos=1/2
5、二倍角公式
sin=2sincos cos=cos^2-sin^2=2cos^2-1=1-2sin^2
6、一元二次方程的解-b+/2a -b-b+/2a
根与系数的关系 X1+X2=-b/a X1X2=c/a注:韦达定理
判别式 b2-4a=0 注:方程有相等的两实根
b2-4ac0 注:方程有一个实根
b2-4ac0 注:方程有共轭复数根
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