hence there is only one solution
Domain of f(x) = sin−1x−sec−1xis
The number of solutions of the equation cos−1(1−x)−2cos−1x=π2is
x= -1/2 does not satisfy the given equation.
considercos−1(−3√2)+sin−1(−12)⇒2π3−π3=π3whichdoesnotsatisfygivenequation