若函数y=Asin(ωx+φ)(A>0,ω>0, |φ|<
)在一个周期内的图象如图所示,M,N分别是这段图象的最高点和最低点,且
·
=0(O为坐标原点),则A等于( )
A． |
B． π |
C． π |
D． π |
相关试题
则函数
的反函数是
Suppose the least distance fron poinrs of the xurve(曲线)
to the y-axis is 
then the velue of a is
A． |
B． |
C．or |
D．or |
时，变量U=
的取值范围是
Ahyperbola(双曲线)wjthvertices(顶点)（-2，5）and(-2,-3),has an asynptote(渐近线)that passes the point(2.5) Then an equarionk of the hyperbola is
A． |
B． |
C．  |
D． |
的最小值是
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