Biến đổi biểu thức \(\sin \alpha - 1\) thành tích.
A.\(\sin \alpha - 1 = 2\sin \left( {\alpha - \frac{\pi }{2}} \right)\cos \left( {\alpha + \frac{\pi }{2}} \right)\)
B.\(\sin \alpha - 1 = 2\sin \left( {\frac{\alpha }{2} - \frac{\pi }{4}} \right)\cos \left( {\frac{\alpha }{2} + \frac{\pi }{4}} \right)\)
C.\(\sin \alpha - 1 = 2\sin \left( {\alpha + \frac{\pi }{2}} \right)\cos \left( {\alpha - \frac{\pi }{2}} \right)\)
D.\(\sin \alpha - 1 = 2\sin \left( {\frac{\alpha }{2} + \frac{\pi }{4}} \right)\cos \left( {\frac{\alpha }{2} - \frac{\pi }{4}} \right)\)
A.\(\sin \alpha - 1 = 2\sin \left( {\alpha - \frac{\pi }{2}} \right)\cos \left( {\alpha + \frac{\pi }{2}} \right)\)
B.\(\sin \alpha - 1 = 2\sin \left( {\frac{\alpha }{2} - \frac{\pi }{4}} \right)\cos \left( {\frac{\alpha }{2} + \frac{\pi }{4}} \right)\)
C.\(\sin \alpha - 1 = 2\sin \left( {\alpha + \frac{\pi }{2}} \right)\cos \left( {\alpha - \frac{\pi }{2}} \right)\)
D.\(\sin \alpha - 1 = 2\sin \left( {\frac{\alpha }{2} + \frac{\pi }{4}} \right)\cos \left( {\frac{\alpha }{2} - \frac{\pi }{4}} \right)\)
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Hóa Học lớp 12
