Matlab Trigonometry and built in functions

Hello Dear Forum Members;

>> cos(pi/5)*cos(pi/5)=(tan(pi/5)+sin(pi/5))/(2*tan(pi/5))
 cos(pi/5)*cos(pi/5)=(tan(pi/5)+sin(pi/5))/(2*tan(pi/5))
                    ↑
Error: The expression to the left of the equals sign is not a valid target for an assignment.

>> cos(pi/5)*cos(pi/5)

ans =

      0.6545

I have written the codes above but they are not matched. I kindly request your help. Thank you...

Answer 1

[James Tursa]

You are missing the /2 inside the cosine on the lhs. E.g.,

>> cos((pi/5)/2)^2
ans =
   0.904508497187474