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i have to find out the sound waves for thirds (eg c and e or d and f or e and g.... u get the picture). its in radians by the way. i figured id worked out the formula for c and the formila for e and just add them but im not sure that is how u work out the soundwave for chords. and i also dont know how to simplify stuff with sin.

sin(32*pi*440^(-1)*t is the formula for c. sin(220^(-1)*pi*2^(-7/12)*t is the formula for e.

t=time and so on a graph its x

now that leaves me with (sin(32*pi*440^(-1)*t)+sin(220^(-1)*pi*2^(-7/12)*t. so i took a stab in the dark even though i knew this would be wrong (which it is) and said it equals sin(3025^(-1)*pi*2^^(-7/12)*t). help please?