A:yet; yet
B:already; already
C:already; yet
D:yet; already
根据拼音写词语。
miàn duì
jiāng lái
yè jiān
míng lǎng
zhèn yǔ
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已知fx=3cosx+3π2+cosx-3π2+sinx+π+a(a∈R,a为常数).
(1)若f(x)为奇函数,求a的值;
(2)若x∈R,求f(x)的最小正周期;
(3)若x∈0,π2时,f(x)的最大值为4,求a的值.
已知f(x)在R上是奇函数,且满足f(x+4)=f(x),当x∈(0,2)时,f(x)=2x2,则f(7)=( )
写出近义词
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