Question 65
Which expression is equivalent to
$$
\frac{\sin^2x-\cos^2x}{\sin^{-1}x+\cos^{-1}x}\cdot\frac{\tan x}{\cos x-\sin x}\,?
$$
$$
\frac{\sin^2x-\cos^2x}{\sin^{-1}x+\cos^{-1}x}\cdot\frac{\tan x}{\cos x-\sin x}\,?
$$
MathNet 2021 — Part 08 Question 65
Math Olympiad Vault · MathNet 2021 — Part 08