I think it's due to it being in radians but even after you convert it to degrees, the answer comes out to be -17.7 which still isn't correct.
Also when I try to use the code
R= Cv/2*(tand(B1) + tand(B2));
I get the error of
Undefined function 'tand' for input
arguments of type 'sym'.
So why exactly is that error occurring?
First two lines of code are:
clear,clc;
syms B1 B2