cho hàm số y=f=(x)sinx phieu nào sau đây ddungs?
a. txđ D=R{0}
b. đồ thị có tâm đối xứng
c.đồ thị có trục đối xứng
d.có tập giá trị là [-1,1]
K
Khách
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16 tháng 8 2021
a) <=> 4sinxcosx -(2cos2x-1)=7sinx+2cosx-4
<=> 2cos2x+(2-4sinx)cosx+7sinx-5=0
- sinx=1 => 2cos2x-2cosx+2=0
pt trên vn
16 tháng 8 2021
b) <=> 2sinxcosx-1+2sin2x+3sinx-cosx-1=0
<=> cos(2sinx-1)+2sin2x+3sinx-2=0
<=> cosx(2sinx-1)+(2sinx-1)(sinx+2)=0
<=> (2sinx-1)(cosx+sinx+2)=0
<=> sinx=1/2 hoặc cosx+sinx=-2(vn)
<=> x= \(\frac{\pi}{6}+k2\pi\) hoặc \(x=\frac{5\pi}{6}+k2\pi\left(k\in Z\right)\)
DH
1
15 tháng 8 2021
- Phép tịnh tiến là một phép dời hình.
- Phép đối xứng trục là một phép dời hình.
- Phép vị tự với tỉ số −1 là một phép dời hình.
- Phép quay là một phép dời hình.
CN
8
17 tháng 8 2021
Mong cô duyệt bái cho em ạ !
I am Kim Lee. I am now 17 years old. When I was at the age of 15 I started getting acne.
My face looked terrible and I always felt depressed and insecure about appearance. Then I came to see one of my best friends, who always gave me good advice and asked her for advice. She told me that I should wash my face several times a day and try different antiacne products, squeeze pimples often. But this way doesn't help a lot. The result of that was 60% of my face was covered with acne.
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17 tháng 8 2021
I am Kim Lee. I am now 17 years old. When I was at the age of 15 I started getting acne.
My face looked terrible, I always felt depressed and insecure about appearance. Then I came to see one of my best friends, who always gave me good advice. I asked her for some advice. She told me that I should wash my face several times a day and try different antiacne products, squeeze pimples often. But this way didn’t help a lot. The result was that 60% of my face was covered with acne.
I found a website advertising an effective way to remove acne, and they advised me to see Dr Kangnam. Dr Kangnam gave me a detailed plan to remove acne on my face. First, he required me to wash my face only twice a day because washing face too often may cause skin irritation. Second, I had to take prescription medicine. Third, I was told to follow a healthy diet, including enough nutrients, eating lots of vegetables, drinking 2 litter of water every day and not consuming too much spicy hot food. Dr Kangnam also said that I shouldn’t stay up late, sleep at least 6 hours a day if I wanted my face to be smooth. After six months of following his instruction, acne clears up amazingly, my skin is smoother and I feel so happy and confident.