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General solution of `2cos2x=-1` is

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in Trigonometry by (123k points)
General solution of `2cos2x=-1` is
A. `2npipm(2pi)/(3), ninZ`
B. `2npipm(3pi)/(2), ninZ`
C. `2npipm(pi)/(3), ninZ`
D. `npipm(pi)/(3), ninZ`
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Correct Answer - D
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