Number of transistors on a Intel chip

Posted by BLOB on Dec 06, 2012; 8:41am
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/Number-of-transistors-on-a-Intel-chip-tp4025797.html

Why does the amount of transistors packed inside the Intel chip or any other microprocessor chip keep on increasing even if it is single core?
Intel 80486DX microprocessor is 32 bit and so is pentium II ... But, the number of transistors in former is 1.2 million and the latter is 7.5 million...
What accounts to the increase in the amount of transistors? They are both single core right?

Also, Can modern microprocessors have in-built functionality to do trigonometric operations/multiplication/divisions?