matlabcalculusinexact-arithmetic

how can I obtain exact values of sin and cos in matlab for angles like pi/4?

if I write in matlab

cos(pi/4)

I get this form:

0.7071

when I'd prefer getting it actual value of (2)^(1/2)/2 to write formulas more clearly. is there a way to do what I ask?

Solution

  • You can you use the Symbolic Math toolbox that comes with many installs of Matlab:

    theta = sym(pi)/4;
cos(theta)

    which returns

    ans =

2^(1/2)/2