Finding the largest angle, beta? .:Resolved:.

[voidflux]

Hello everyone!!
I'm stuck on this question!
It says, In a small angle approximation, tan beta ~ sin beta, and ~ means is the order of magnitude of
Use your calculator to find the largest angle, beta, (in radians) for which the difference of sin beta - tan beta is less than 21.6% of the sin beta value. Any idea's?

Thanks for listening!