Giải các phương trình sau:
a) \(10 \cos x - 5 = 0 \,; \, \, \, \)
b) \(3{ \sin ^2}x + \sin x - 4 = 0 \)
A.a)
\(x = \pm \frac{\pi }{3} + k2\pi \)
b)
\(x = \frac{\pi }{2} + k2\pi \)
B.a)
\(x = \pm \frac{\pi }{4} + k2\pi \)
b)
\(x = \frac{\pi }{2} + k2\pi \)
C.a)
\(x = \pm \frac{\pi }{3} + k2\pi \)
b)
\(x = \frac{\pi }{6} + k2\pi \)
D.a)
\(x = \pm \frac{\pi }{3} - k2\pi \)
b)
\(x = \frac{\pi }{2} + k2\pi \)
a) \(10 \cos x - 5 = 0 \,; \, \, \, \)
b) \(3{ \sin ^2}x + \sin x - 4 = 0 \)
A.a)
\(x = \pm \frac{\pi }{3} + k2\pi \)
b)
\(x = \frac{\pi }{2} + k2\pi \)
B.a)
\(x = \pm \frac{\pi }{4} + k2\pi \)
b)
\(x = \frac{\pi }{2} + k2\pi \)
C.a)
\(x = \pm \frac{\pi }{3} + k2\pi \)
b)
\(x = \frac{\pi }{6} + k2\pi \)
D.a)
\(x = \pm \frac{\pi }{3} - k2\pi \)
b)
\(x = \frac{\pi }{2} + k2\pi \)
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Hóa Học lớp 12
