help undefined reference to `cos'

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hello forum
I got "undefined reference to `cos' error" for ARM Cortex M4

where to change below Eclipse makefile ?
thank you

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#-------------------------------------------------------------------------------

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#    Rules

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#-------------------------------------------------------------------------------

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# Flags

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CFLAGS = -Wall -fno-common -c -g -mcpu=cortex-m3 -mthumb

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CFLAGS += -g $(OPTIMIZATION) $(INCLUDES) -DTRACE_LEVEL=$(TRACE_LEVEL)

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ASFLAGS = -g -mapcs-32

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LDFLAGS = -mcpu=cortex-m3 -mthumb -g -v -nostartfiles

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OBJCOPYFLAGS = -O binary

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OBJDUMPFLAGS = -x --syms -S

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all: $(BIN) $(OBJ) $(OUTPUT).out

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$(BIN) $(OBJ):

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  mkdir $@

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$(OUTPUT).out: $(C_OBJECTS) $(ASM_OBJECTS) $(LINKER_SCRIPT)

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  @ echo "..linking"

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  $(LD) $(LDFLAGS) -T$(LINKER_SCRIPT) -o $(OUTPUT).out $(C_OBJECTS) $(ASM_OBJECTS) libgcc.a

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  $(OBJCOPY) $(OBJCOPYFLAGS) $(OUTPUT).out $(OUTPUT).bin

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#   $(OBJDUMP) $(OBJDUMPFLAGS) $(OUTPUT).out > $(OUTPUT).lss

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  @ echo "...completed."
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