11 months agoFebruary 20 Morning Devotional | Go First to God | Morning and Evening by Charles SpurgeonRevive ScripturesVerified
2 years agoAdded vacuum material – Solar-planet atm. refraction model, v. IOR index=0.8| DISPERSION= 0.000354px2195
3 years agoBut why does the 2nd Derivative Test identify max's, min's and saddles points?Integral and multivariable calculus