# 1991 AHSME Problems/Problem 21

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

For all real numbers $x$ except $x=0$ and $x=1$ the function $f(x)$ is defined by $f(x/(1-x))=1/x$. Suppose $0\leq t\leq \pi/2$. What is the value of $f(\sec^2t)$?