Question

MEDAL

Which of the following is a sinusoid?
A. (x^2/3) + (y^2/6) = 1
B. x^2 + y^2 = 1
C. y = x^(1/3)
D. y = cos(x) - 2

Answer 1

@magbak @Mertsj @robtobey @Luigi0210 @terenzreignz

Answer 2

sinusoid means sine wave?

Answer 3

Yes!

Answer 4

The only sinusoidal function is the one with a cosine of x.

Answer 5

Well there's only one function there close to sine.. cosine..

Answer 6

Thats what I was thinking. Is that because cos(x) = sin(x + π/2)?
I wanted to make sure D. was the answer

Answer 7

Thank you both

Answer 8

See attached plot.

Answer 9

" Is that because cos(x) = sin(x + π/2)"
Yep.

Answer 10

Okay, thanks guys! I have to recheck my work

Answer 11

@robtobey google will save you a lot of time: https://www.google.com/search?q=cos(x)+-+2&oq=cos(x)+-+2&aqs=chrome.0.69i57&sourceid=chrome&ie=UTF-8

Answer 12

@agent0smith

Thank you for the site reference.