[" 7.Solve "sin5x=cos2x],[" 2.Find the n...

[" 7.Solve "sin5x=cos2x],[" 2.Find the number of values of "x" in "[0,5 pi]" satisfying the equation "3cos^(2)x-10cos x+7=0" ."],[" If "2tan^(2)x-5sec x" is eare "1" to "x" ."]

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