Giải các phương trình sau:
a) \(\cos 2x - 5\sin x - 3 = 0\).
b) \(\left[ {1 + \cos \left( {x + \frac{\pi }{2}} \right)} \right]{\tan ^2}x - \cos x = 1\).
A.a)\(\left\{ { - \frac{\pi }{6} + k2\pi ;\frac{{7\pi }}{6} + k2\pi ,k \in Z} \right\}\).
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{4} + k\pi ,k \in Z} \right\}\).
B.a)\(\left\{ { - \frac{\pi }{6} + k2\pi ;\frac{{11\pi }}{6} + k2\pi ,k \in Z} \right\}\).
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{2} + k\pi ,k \in Z} \right\}\).
C.a)\(\left\{ { - \frac{\pi }{9} + k2\pi ;\frac{{7\pi }}{6} + k2\pi ,k \in Z} \right\}\)
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{4} + k\pi ,k \in Z} \right\}\).
D.a)\(\left\{ { - \frac{\pi }{6} + k2\pi ;\frac{{7\pi }}{5} + k2\pi ,k \in Z} \right\}\).
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{4} + k\pi ,k \in Z} \right\}\).
a) \(\cos 2x - 5\sin x - 3 = 0\).
b) \(\left[ {1 + \cos \left( {x + \frac{\pi }{2}} \right)} \right]{\tan ^2}x - \cos x = 1\).
A.a)\(\left\{ { - \frac{\pi }{6} + k2\pi ;\frac{{7\pi }}{6} + k2\pi ,k \in Z} \right\}\).
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{4} + k\pi ,k \in Z} \right\}\).
B.a)\(\left\{ { - \frac{\pi }{6} + k2\pi ;\frac{{11\pi }}{6} + k2\pi ,k \in Z} \right\}\).
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{2} + k\pi ,k \in Z} \right\}\).
C.a)\(\left\{ { - \frac{\pi }{9} + k2\pi ;\frac{{7\pi }}{6} + k2\pi ,k \in Z} \right\}\)
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{4} + k\pi ,k \in Z} \right\}\).
D.a)\(\left\{ { - \frac{\pi }{6} + k2\pi ;\frac{{7\pi }}{5} + k2\pi ,k \in Z} \right\}\).
b)\(\left\{ {\pi + k2\pi ; - \frac{\pi }{4} + k\pi ,k \in Z} \right\}\).
Loga
Hóa Học lớp 12
