If (a,b) is a point on the terminal side of angle t in standard position, then cos(t)

Oct 2014
133
2
Florida
Cos Terminal.png

How do I know what it is supposed to be? Please explain. Thank you!
 

skeeter

MHF Helper
Jun 2008
16,217
6,765
North Texas
Re: If (a,b) is a point on the terminal side of angle t in standard position, then co



sketch a reference triangle ...

adjacent side = a

opposite side = b

hypotenuse = ?

cosine is the ratio = $\dfrac{\text{? side}}{\text{? side}}$
 
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Oct 2014
133
2
Florida
Re: If (a,b) is a point on the terminal side of angle t in standard position, then co

Cosine is the ration of adjacent/hypotenuse.

Does that then make the answer c. a/sqrt a^2 + b^2?
 

skeeter

MHF Helper
Jun 2008
16,217
6,765
North Texas
Re: If (a,b) is a point on the terminal side of angle t in standard position, then co

Cosine is the ratio of adjacent/hypotenuse.

Does that then make the answer c. a/sqrt(a^2 + b^2)?
fixed ...