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  1. S

    Need help

    You can find them in most of the libraries when you need it.
  2. S

    how do I prove two graphs are equivalent?

    First write the left side as P(x)=6cos2(2x) then use the double-angle identity : Cos(2x) = 2cos2(x) – 1 --> cos2(x) = (1 + cos(2x))/2 Apply to cos2(2x) --> cos2(2x) = (1 + cos(4x))/2 Substitue in P(x) : P(x) = 6(1 + cos(4x))/2 = 3(1+cos(4x)) = R(x)
  3. S

    trigonometry question

    a)Find the angle at the dish : (6378/sin24)=7358/sinD) --> D= 28. Then find the angle at the centre of the earth : 180-(24+28) = 128. Distance from the dish to satellite : (x/sin128) = (6378/sin24) --> x = 12357 km b) 12357/300000 = 0.041 second Although this answer is correct mathematically, I...
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