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Mathematics 7 Online
OpenStudy (anonymous):

i need help, see attachment

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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