数学公式:三角函数的降幂公式
2016-06-13 10:41
来源:新东方
作者:新东方
降幂公式
sin?α=[1-cos(2α)]/2=versin(2α)/2
cos?α=[1+cos(2α)]/2=vercos(2α)/2
tan?α=[1-cos(2α)]/[1+cos(2α)]
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