题目内容
将函数
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A.

B.

C.

D.
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【答案】分析:根据三角函数的图象的平移法则,依据原函数横坐标伸长到原来的2倍可得到新的函数的解析式,进而通过左加右减的法则,依据图象向左平移
个单位得到y=sin[
(x+
-
],整理后答案可得.
解答:解:将的图象上所有点的横坐标伸长到原来的2倍(纵坐标不变),
可得函数y=sin(
x-
),再将所得的图象向左平移
个单位,
得函数y=sin[
(x+
-
],即y=sin(
x-
)
故选C
点评:本题主要考查了三角函数的图象的变换.要特别注意图象平移的法则.




解答:解:将的图象上所有点的横坐标伸长到原来的2倍(纵坐标不变),
可得函数y=sin(



得函数y=sin[





故选C
点评:本题主要考查了三角函数的图象的变换.要特别注意图象平移的法则.

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