Hi Folks,

when i graph y=2x i get a straight line through 0,0 with gradient of 2

when i then graph y=sin(2x) i see a sin wave to which my first f(x) is tangent.

what is the precise mathematical relationship betw these two coefficients that allows me to predict the tangent to a given sin wave?

thx,

godfreysown (prompted by his so called unmathematical girlfriend whom i have been unable to answer to her satisifaction