Giải phương trình \({\cos ^3}x + {\sin ^3}x = 2\left( {{{\cos }^5}x + {{\sin }^5}x} \right)\)
A.\(x = \pm {\pi \over 4} + k2\pi \,\,\left( {k \in Z} \right)\)
B.\(x = {\pi \over 4} + {{k\pi } \over 2}\,\,\left( {k \in Z} \right)\)
C.\(x = \pm {\pi \over 4} + {{k\pi } \over 3}\,\,\left( {k \in Z} \right)\)
D.\(x = {\pi \over 4} + k\pi \,\,\left( {k \in Z} \right)\)
A.\(x = \pm {\pi \over 4} + k2\pi \,\,\left( {k \in Z} \right)\)
B.\(x = {\pi \over 4} + {{k\pi } \over 2}\,\,\left( {k \in Z} \right)\)
C.\(x = \pm {\pi \over 4} + {{k\pi } \over 3}\,\,\left( {k \in Z} \right)\)
D.\(x = {\pi \over 4} + k\pi \,\,\left( {k \in Z} \right)\)
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Hóa Học lớp 12
