a. f(u)=cscuf\left( u \right) = cscuf(u)=cscu, u=πx+1u=\pi x+1u=πx+1
b. πcsc(πx+1)⋅cot(πx+1)\pi \csc \left( {\pi x + 1} \right) \cdot \cot \left( {\pi x + 1} \right)πcsc(πx+1)⋅cot(πx+1)