Google released a powerful tool for analysis of long-term cultural trends: Google Ngram Viewer, a database of 500 billion words – mainly in English – and their occurrence in books over the last 2 centuries.
Hear is a graph for “logarithm, square root,exponent,cosine” from 1880 to 2008. From 1960-s, all mathematical terms appear to show a steady and significant decline in frequency of their occurrence in books. What could this mean?
If you wish to run proper statistical analysis, Google kindly provides files with raw data.