How many positive numbers of x satisfy satisfy the equation cos(97x)=x?

# How many positive numbers

**Nirbhay**#2

there are no such positive numbers thats satisfies the above equation. only ‘0’ satiesfies above equation.

cos(97x)=x

x=(1/97)cos−1(x)

domain of cos inverse function is [-1,1] i.e, x can take value from -1 to 1.

range of cos inverse function is [0,π] i.e, always positive.