please include details so i can learn, i'm so confused.
you should know that: cosx = sen (90° - x)
cos ( x -90°) = sen( 90° -x+90°) = sen ( 180° -x) = senx
y= - senx,
here's your graph : http://www.wolframalpha.com/input/?i=y%3D+-+senx+
Download Graph 4.4 from www.padowan.dk for free.
On "Insert function", type -cos(x-(pi/2)), then "OK".
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you should know that: cosx = sen (90° - x)
cos ( x -90°) = sen( 90° -x+90°) = sen ( 180° -x) = senx
y= - senx,
here's your graph : http://www.wolframalpha.com/input/?i=y%3D+-+senx+
Download Graph 4.4 from www.padowan.dk for free.
On "Insert function", type -cos(x-(pi/2)), then "OK".