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bichtran5
2 năm trước
Tìm các nghiệm của phương trình: a) cos (2x+$\frac{pi}{3}$) + cos (x -$\frac{pi}{6}$) = 0 b) cos (2x-$\frac{pi}{4}$) + sin ($\frac{pi}{3}$-x) = 0 c) 8$sin^{2}$x + 6cosx-9 = 0 d) 6$sin^{2}$4x - cox16x-5 = 0
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