(d)/( dx ) [ cos"" (x) /( 2) ]=...

`(d)/( dx ) [ cos"" (x) /( 2) ]=`

`1/2 sin "" (x)/(2)`

`-1/2 cos "" (x)/(2)`

`-1/2 sin"" (x)/( 2)`

`- sin "" (x)/(4)`

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