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Solve the trigonometric equation: cos4x=cos2x

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Solve the trigonometric equation: 3cos^(2)theta+7sin^(2)theta=4

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Find the value of the trigonometric function sin(-(11 pi)/(3))

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Statement I Common value(s) of 'x' satisfying the equation . log_(sinx )( sec x +8) gt o and log_(sinx) cos x + log_(cos x ) sin x =2 in (0, 4pi) does not exist. Statement II On solving above trigonometric equations we have to take intersection of trigonometric chains given by sec x gt 1 and x = n pi +(pi)/(4), n in I