In[]:=
NSum[Zeta[2k]/k^2,{k,1,Infinity}],NSumPolyLog2,
1
k^2
,{k,1,Infinity},NSum
HypergeometricPFQ{1,1,1},{2,2},
1
k^2

k^2
,{k,1,Infinity},NSum-MeijerG{{1,1,1},{}},{{1},{0,0}},-
1
2
k
,{k,1,Infinity},NSum-FoxH{{{1,1},{1,1},{1,1}},{}},{{{1,1}},{{0,1},{0,1}}},-
1
2
k
,{k,1,Infinity},NIntegrate2
LogPi
x
Sin[Pix]

x
,{x,0,1},NIntegrate2
Log
x
Sin[x]

x
,{x,0,Pi},NIntegrate
2(LogGamma[1+x]+LogGamma[1-x])
x
,{x,0,1},NIntegrate
1-Pi
xy
*CotPi
xy

2xy
,{x,0,1},{y,0,1}//MatrixForm
Out[]//MatrixForm=
2.31268
2.31268
2.31268
2.31268
2.31268
2.31268
2.31268
2.31268
2.31268