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[" If "x=(pi,(3 pi)/(2))" then "],[4cos^...

[" If "x=(pi,(3 pi)/(2))" then "],[4cos^(2)((pi)/(4)-(x)/(2))+sqrt(4sin^(4)x+sin^(2)2x)" is always "],[" equal to: "]

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If x in(pi,(3 pi)/(2)), then 4cos^(2)((pi)/(4)-(x)/(2))+sqrt(4sin^(4)x+sin^(2)2x) is always equal to (a)1(b)2(c)-2(d) none of these

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cos((3pi)/(4)+x)-cos ((3pi)/(4)-x)=-sqrt(2) sin x

cos ((3pi)/( 4) + x) - cos((3pi)/( 4) -x) =- sqrt2 sin x

cos ((3pi)/( 4) + x) - cos((3pi)/( 4) -x) =- sqrt2 sin x

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