Here's the question you clicked on:
greysmither
Which of the following functions is not a sinusoid? y = sin x y = cosx y = sqrt(x) or They are all sinusoids.
sinusoid is a mathematical function that describes a smooth repetitive oscillation
square root sorta looks like |dw:1328887057359:dw|
basically...imagine a DNA but only a single helix =))))))...anyway...obviously sinxis a SINusoid...cosine is just a vertical graph of sinx so both are sinusoid
OH! I get it now. Thank you guys :) Esp. the drawings, they were very helpful
Yes, if you see the graph of \( y=\sqrt{x} \) it's easy to note that it's not a sinusoid. you could use this site : http://www.wolframalpha.com/
The square root drawing only depicts the positive roots, imagine a similar curve on the left (quadrant II)