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OpenStudy (anonymous):
i need help, see attachment
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OpenStudy (anonymous):
OpenStudy (maheshmeghwal9):
cos(4x)=0 since cos(u + v) = cos(u).cos(v)-sin(u).sin(v)
OpenStudy (maheshmeghwal9):
now solve for x
OpenStudy (maheshmeghwal9):
interval is [0,2pi] so there shouldn't be any problem:)
OpenStudy (maheshmeghwal9):
i think answer should be 'B' since all values are x/4 and continuously increasing in the interval of 2pi. bcoz cos function repeats its value after a period of 2pi.
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