Hộ mks bài 5 phần b với 😅
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\(4sin^2x-2\left(\sqrt{3}+\sqrt{2}\right)sinx+\sqrt{6}=0\)
\(\Leftrightarrow4sin^2x-2\sqrt{3}sinx-2\sqrt{2}sinx+\sqrt{6}=0\)
\(\Leftrightarrow2sinx\left(2sinx-\sqrt{3}\right)-\sqrt{2}\left(2sinx-\sqrt{3}\right)=0\)
\(\Leftrightarrow\left(2sinx-\sqrt{3}\right)\left(2sinx-\sqrt{2}\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}sinx=\dfrac{\sqrt{3}}{2}\\sinx=\dfrac{\sqrt{2}}{2}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{\pi}{3}+k2\pi\\x=\dfrac{2\pi}{3}+k2\pi\\x=\dfrac{\pi}{4}+k2\pi\\x=\dfrac{3\pi}{4}+k2\pi\end{matrix}\right.\)
1 was sung
2 was bitten
3 was stolen
4 Was - given
5 weren't made
6 was cooked
7 weren't sent
8 were told
9 is drunk
10 was destroyed
Xét ΔDBC có
BA là đường trung tuyến
BA=DC/2
Do đó: ΔDCB vuông tại B
Câu 4:
a: Ta có: R(x)=0
\(\Leftrightarrow2x+3=0\)
hay \(x=-\dfrac{3}{2}\)
b: Ta có: H(x)=0
\(\Leftrightarrow\left(x-1\right)\left(x+1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-1\end{matrix}\right.\)