Phương trình: $\displaystyle 4{{\cos }^{5}}x.\sin x-4{{\sin }^{5}}x.\cos x={{\sin }^{2}}4x$ có các nghiệm là
A. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{4}\\x=\frac{\pi }{8}+k\frac{\pi }{2}\end{array} \right.$
B. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{2}\\x=\frac{\pi }{4}+k\frac{\pi }{2}\end{array} \right.$
C. $\displaystyle \left[ \begin{array}{l}x=k\pi \\x=\frac{3\pi }{4}+k\pi \end{array} \right.$
D. $\displaystyle \left[ \begin{array}{l}x=k2\pi \\x=\frac{\pi }{3}+k2\pi \end{array} \right.$
A. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{4}\\x=\frac{\pi }{8}+k\frac{\pi }{2}\end{array} \right.$
B. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{2}\\x=\frac{\pi }{4}+k\frac{\pi }{2}\end{array} \right.$
C. $\displaystyle \left[ \begin{array}{l}x=k\pi \\x=\frac{3\pi }{4}+k\pi \end{array} \right.$
D. $\displaystyle \left[ \begin{array}{l}x=k2\pi \\x=\frac{\pi }{3}+k2\pi \end{array} \right.$
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Hóa Học lớp 12
