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diff --git a/DSP_Lib/Source/FastMathFunctions/arm_cos_q31.c b/DSP_Lib/Source/FastMathFunctions/arm_cos_q31.c
deleted file mode 100644
index 72c51e6..0000000
--- a/DSP_Lib/Source/FastMathFunctions/arm_cos_q31.c
+++ /dev/null
@@ -1,96 +0,0 @@
-/* ----------------------------------------------------------------------
-* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
-*
-* $Date:        07. September 2015
-* $Revision:    V.1.4.5 a
-*
-* Project:      CMSIS DSP Library
-* Title:        arm_cos_q31.c
-*
-* Description: Fast cosine calculation for Q31 values.
-*
-* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
-*
-* Redistribution and use in source and binary forms, with or without
-* modification, are permitted provided that the following conditions
-* are met:
-*   - Redistributions of source code must retain the above copyright
-*     notice, this list of conditions and the following disclaimer.
-*   - Redistributions in binary form must reproduce the above copyright
-*     notice, this list of conditions and the following disclaimer in
-*     the documentation and/or other materials provided with the
-*     distribution.
-*   - Neither the name of ARM LIMITED nor the names of its contributors
-*     may be used to endorse or promote products derived from this
-*     software without specific prior written permission.
-*
-* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-* POSSIBILITY OF SUCH DAMAGE.
-* -------------------------------------------------------------------- */
-
-#include "arm_math.h"
-#include "arm_common_tables.h"
-
-/**
- * @ingroup groupFastMath
- */
-
- /**
- * @addtogroup cos
- * @{
- */
-
-/**
- * @brief Fast approximation to the trigonometric cosine function for Q31 data.
- * @param[in] x Scaled input value in radians.
- * @return  cos(x).
- *
- * The Q31 input value is in the range [0 +0.9999] and is mapped to a radian
- * value in the range [0 2*pi).
- */
-
-q31_t arm_cos_q31(
-  q31_t x)
-{
-  q31_t cosVal;                                  /* Temporary variables for input, output */
-  int32_t index;                                 /* Index variables */
-  q31_t a, b;                                    /* Four nearest output values */
-  q31_t fract;                                   /* Temporary values for fractional values */
-
-  /* add 0.25 (pi/2) to read sine table */
-  x = (uint32_t)x + 0x20000000;
-  if(x < 0)
-  {   /* convert negative numbers to corresponding positive ones */
-      x = (uint32_t)x + 0x80000000;
-  }
-
-  /* Calculate the nearest index */
-  index = (uint32_t)x >> FAST_MATH_Q31_SHIFT;
-
-  /* Calculation of fractional value */
-  fract = (x - (index << FAST_MATH_Q31_SHIFT)) << 9;
-
-  /* Read two nearest values of input value from the sin table */
-  a = sinTable_q31[index];
-  b = sinTable_q31[index+1];
-
-  /* Linear interpolation process */
-  cosVal = (q63_t)(0x80000000-fract)*a >> 32;
-  cosVal = (q31_t)((((q63_t)cosVal << 32) + ((q63_t)fract*b)) >> 32);
-
-  return cosVal << 1;
-}
-
-/**
- * @} end of cos group
- */