若将y=f(x)的图像按向量a=(π/6,1/2)平移1.化简√1-sin110°A.cos55° B.cos55°-sin55°C.sin55° D±(cos55°-sin55°)2.y=cos2x-√3sin2x的一条对称轴是A.π/6 B.-π/12 C.π/4 D.-π/63.若将y=f(x)的图像按向量a=(π/6,1/2)平移
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若将y=f(x)的图像按向量a=(π/6,1/2)平移1.化简√1-sin110°A.cos55° B.cos55°-sin55°C.sin55° D±(cos55°-sin55°)2.y=cos2x-√3sin2x的一条对称轴是A.π/6 B.-π/12 C.π/4 D.-π/63.若将y=f(x)的图像按向量a=(π/6,1/2)平移
若将y=f(x)的图像按向量a=(π/6,1/2)平移
1.化简√1-sin110°
A.cos55° B.cos55°-sin55°
C.sin55° D±(cos55°-sin55°)
2.y=cos2x-√3sin2x的一条对称轴是
A.π/6 B.-π/12 C.π/4 D.-π/6
3.若将y=f(x)的图像按向量a=(π/6,1/2)平移后得到y=2sin(x-5/6π)+1的图像,则y=f(x)的递减区间是?
若将y=f(x)的图像按向量a=(π/6,1/2)平移1.化简√1-sin110°A.cos55° B.cos55°-sin55°C.sin55° D±(cos55°-sin55°)2.y=cos2x-√3sin2x的一条对称轴是A.π/6 B.-π/12 C.π/4 D.-π/63.若将y=f(x)的图像按向量a=(π/6,1/2)平移
1.√(1-sin110°)=√(sin55°)^2+cos(55°)^2-2sin55°cos55°=sin55°-cos55°(无答案)
2.y=cos2x-√3sin2x=2sin(π/6-2x)
将(π/6-2x)看成一个整体,并代入A、B、C、D得(π/6-2x)分别为-π/6、π/3、-π/3、π/2.
所以选D.
若为解答题,则 令π/6-2x=kπ+π/2 (k属于整数)解得x= -kπ/2-π/6;
k=0时,x= -π/6. 答案:D
3.f(x)向上平移1/2个单位,再向右平移 π/6个单位得y=2sin(x-5/6π)+1 则
f(x)=2sin(x-2π/3)+1/2;令2kπ+π/2≤x-2π/3≤2kπ+π
=>2kπ+7π/6≤x≤2kπ+5π/3 (k属于整数)
1 C 原式=√1-2sin55cos55=√sin²55+cos²55-2cos55sin55=√(sin55-cos55)²=sin55-cos55
2 D y=2(1/2cos2x-√3/2sin2x)=2sin(π/6-2x)
π/6-2x=kπ+π/2
x=-πk/2-π/6
k=0时,x=-π/6
3 不会
1/ sin55°-cos55° 答案此处有误
2 D
3. 原式=y-1/2-1/2=2sin(x-pi/6-4pi/6)
即y=2sin(x-2pi/3)+1/2
单调减区间为
7pi/6+2kpi<=x<=13pi/6+2kpi
欢迎追问,望采纳。。。
我无意间跑这里来,打扰了。看都看不懂。