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f x )= 1 cos x 2 x 2 fx 1 cos x 2 x 2 let f x )= cos 1 x 2 1 x 2 f x )= √ 1 cos 2 x 2 f x )= root 1 cos 2 x 2 f x )= 1 cos 2 kx x 2 find the value of k if f x )= 1 cos x 2 x 2 f x )=( sin (- 1 x 2 )+( cos (- 1 x 2 is stationary at let f x cos x 1 x 2 2 then f x )= cos (- 1 )(( sqrt 2x 2 )+ 1 x 2 )+ 1 ))
