Let
f
(
x
)
=
−
8
x
sin
x
+
cos
x
\displaystyle {f{{\left({x}\right)}}}=\frac{{-{8}{x}}}{{{\sin{{x}}}+{\cos{{x}}}}}
f
(
x
)
=
sin
x
+
cos
x
−
8
x
f
′
(
2
π
)
=
\displaystyle {f}'{\left({2}\pi\right)}=
f
′
(
2
π
)
=
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Enter DNE for Does Not Exist, oo for Infinity