\frac{ 1 }{ { \tau }_{ 0 } } \int_{ -T }^{ T } \left( 1- \frac{ \left| t \right| }{ T } \right) { e }^{ -j { w }_{ 0 } nt } d t
Evaluate
\frac{\int _{-T}^{T}\frac{T-|t|}{Te^{jntw_{0}}}\mathrm{d}t}{\tau _{0}}
Differentiate w.r.t. τ_0
-\frac{\int _{-T}^{T}\frac{T-|t|}{Te^{jntw_{0}}}\mathrm{d}t}{\tau _{0}^{2}}
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