Among other things, SharkD saw fit to write:

>> You just cancel the sin(theta) term on each side, leaves you with:
>> 
>> 1/cos(theta) = r2/r1
>> 
>> Taking the reciprocal of both sides then leaves you with the answer.
>> 
> 
> Thank you! I forgot that tan = sin/cos.

You all missed the last step:

theta = arccos(R1/R2)    ;-)


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