Posted by Anonymous on .
how many solutions does the system {y = x, y = tan x have?
what is sec^1 (secð)?

Trigonometry 
Reiny,
make a sketch of their graphs and see where they intersect.
Here is one of the best websites for graphing ...
http://rechneronline.de/functiongraphs/
enter:
x for the first graph
tan(x) for the second graph
change "Range xaxis from" 20 to 20
change "Range yaxis from" 50 to 50
As you can see there will be an infinite number of solutions
the obvious one is x=0
the next one is
another is appr 10.904
check:
y = x = 10.904
y = tan(10.904) = 10.9