A. \(x = \frac{\pi }{{20}} + k\frac{\pi }{2};x = \frac{\pi }{5} + k\frac{\pi }{2},k \in \mathbb{Z}.\)
B. \(x = \frac{\pi }{{20}} + k\frac{\pi }{2};x = \frac{\pi }{{10}} + k\frac{\pi }{2},k \in \mathbb{Z}.\)
C. \(x = \frac{\pi }{{10}} + k\frac{\pi }{2};x = \frac{\pi }{5} + k\frac{\pi }{2},k \in \mathbb{Z}.\)
D. \(x = \frac{{3\pi }}{5} + k\frac{\pi }{2};x = \frac{\pi }{{10}} + k\frac{\pi }{2},k \in \mathbb{Z}.\)
A. \(x = \pm \arccos \frac{2}{5} - \frac{\pi }{{18}} + k2\pi ,k \in \mathbb{Z}.\)
B. \(x = \pm \arccos \frac{2}{5} + \frac{\pi }{{18}} + k2\pi ,k \in \mathbb{Z}.\)
C. \(x = \pm \arccos \frac{5}{2} - \frac{\pi }{{18}} + k2\pi ,k \in \mathbb{Z}.\)
D. \(x = \pm \arccos \frac{5}{2} + \frac{\pi }{{18}} + k2\pi ,k \in \mathbb{Z}.\)
A. \({x_1} = 5 - \frac{{11\pi }}{6};{x_2} = 5 - \frac{{13\pi }}{6}.\)
B. \({x_1} = 5 + \frac{{11\pi }}{6};{x_2} = 5 - \frac{{13\pi }}{6}.\)
C. \({x_1} = 5 - \frac{{11\pi }}{6};{x_2} = 5 + \frac{{13\pi }}{6}.\)
D. \({x_1} = 5 + \frac{{11\pi }}{6};{x_2} = 5 + \frac{{13\pi }}{6}.\)
A. \(x = \frac{{3\pi }}{5} + k\pi ,k \in \mathbb{Z}.\)
B. \(x = \frac{\pi }{5} + k\pi ,k \in \mathbb{Z}.\)
C. \(x = \frac{{3\pi }}{5} + \frac{{k\pi }}{3},k \in \mathbb{Z}.\)
D. \(x = \frac{\pi }{5} + \frac{{k\pi }}{3},k \in \mathbb{Z}.\)
A. \(x = - \frac{1}{6} + k\frac{\pi }{2},k \in \mathbb{Z}.\)
B. \(x = - \frac{1}{3} + k\frac{\pi }{2},k \in \mathbb{Z}.\)
C. \(x = - \frac{1}{6} + k\pi ,k \in \mathbb{Z}.\)
D. \(x = - \frac{1}{3} + k\pi ,k \in \mathbb{Z}.\)
A. \(x = - {200^0} + k{360^0},k \in \mathbb{Z}.\)
B. \(x = - {200^0} + k{720^0},k \in \mathbb{Z}.\)
C. \(x = - {20^0} + k{360^0},k \in \mathbb{Z}.\)
D. \(x = - {20^0} + k{720^0},k \in \mathbb{Z}.\)
A. \(x = \frac{{7\pi }}{{18}} + \frac{{k2\pi }}{3};x = \frac{{7\pi }}{6} + k2\pi ,k \in \mathbb{Z}.\)
B. \(x = - \frac{{7\pi }}{{18}} + \frac{{k2\pi }}{3};x = \frac{{7\pi }}{6} + k2\pi ,k \in \mathbb{Z}.\)
C. \(x = - \frac{{7\pi }}{{18}} + \frac{{k2\pi }}{3};x = - \frac{{7\pi }}{6} + k2\pi ,k \in \mathbb{Z}.\)
D. \(x = \frac{{7\pi }}{{18}} + \frac{{k2\pi }}{3};x = - \frac{{7\pi }}{6} + k2\pi ,k \in \mathbb{Z}.\)
A. 262
B. 266
C. 281
D. 292
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