Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

mikau
2005-11-18 15:55:09

"Trig waves"? BLASPHEMY! >:-O

ryos
2005-11-18 12:04:51

Plain old cosx has a period of 2π. The variable (t) inside of cos is multiplied by 5, which compresses the period. So, the answer is 2π/5

The shift is the quantity subtracted from the variable inside cos. It seems that the shift is divided by the coefficient of t, giving 3π/10. I don't know why this is, but I just varified it with a graphing program and it's true.

Lloyd W
2005-11-18 04:20:40

y = 15 cos (5t - ( 3pi / 2 ) )


Now I know that the amplitude is 15 (obviously)

but how do i work out the frequency and phase.???

ironicly i have the answers which are that the period (T) = 2pi/5 and the phase shift is 3pi/10 compared to y=15cos5t


but how do u do it?
please help me

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