Question: W e have f ' ( x ) = 2 c o s ( x ) - 2 s i n ( x ) ,

We have f'(x)=2cos(x)-2sin(x),so
f''(x)=
which equals 0 when tan(x)=
. Hence, in the interval 0x2,f''(x)=0 when x=34 and x=
W e have f ' ( x ) = 2 c o s ( x ) - 2 s i n ( x

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