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（不計(jì)入總分）：已知函數(shù),設(shè)函數(shù)，

（3）當(dāng)a≠0時(shí)，求在上的最小值.

 

(8)已知函數(shù)f(x)=asinx-bcosx  (a、b為常數(shù)，a≠0,x∈R)在x=處取得最小值，則函數(shù)y=f(-x)是

  (A)偶函數(shù)且它的圖象關(guān)于點(diǎn)(π，0)對(duì)稱(chēng)         (B)偶函數(shù)且它的圖象關(guān)于點(diǎn)(，0)對(duì)稱(chēng)

  (C)奇函數(shù)且它的圖象關(guān)于點(diǎn)(，0)對(duì)稱(chēng)     (D)奇函數(shù)且它的圖象關(guān)于點(diǎn)(π，0)對(duì)稱(chēng)

已知函數(shù)f(x)=asinx-bcosx(a、b為常數(shù)，a≠0,x∈R)在x=處取得最小值，則函數(shù)y=f -x是(    )

A．偶函數(shù)且它的圖象關(guān)于點(diǎn)(π，0)對(duì)稱(chēng)B．偶函數(shù)且它的圖象關(guān)于點(diǎn)(，0)對(duì)稱(chēng)

C．奇函數(shù)且它的圖象關(guān)于點(diǎn)(，0)對(duì)稱(chēng)D．奇函數(shù)且它的圖象關(guān)于點(diǎn)(π，0)對(duì)稱(chēng)

已知函數(shù)f(x)="a" sinx-bcosx  (a、b為常數(shù)，a≠0,x∈R)在x=處取得最小值，則函數(shù)y=f(-x)是(     )

A．偶函數(shù)且它的圖象關(guān)于點(diǎn)(π，0)對(duì)稱(chēng)

B．偶函數(shù)且它的圖象關(guān)于點(diǎn)(，0)對(duì)稱(chēng)

C．奇函數(shù)且它的圖象關(guān)于點(diǎn)(，0)對(duì)稱(chēng)

D．奇函數(shù)且它的圖象關(guān)于點(diǎn)(π，0)對(duì)稱(chēng)

 

已知函數(shù)f(x)=asinx-bcosx(a、b為常數(shù),a≠0,x∈R)在x=處取得最小值,則函數(shù)y=f(-x)是（    ）

A.偶函數(shù)且它的圖象關(guān)于點(diǎn)(π,0)對(duì)稱(chēng)

B.偶函數(shù)且它的圖象關(guān)于點(diǎn)(,0)對(duì)稱(chēng)

C.奇函數(shù)且它的圖象關(guān)于點(diǎn)(,0)對(duì)稱(chēng)

D.奇函數(shù)且它的圖象關(guān)于點(diǎn)(π,0)對(duì)稱(chēng)