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

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

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

    How do I know what it is supposed to be? Please explain. Thank you!
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    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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    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?
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    Re: If (a,b) is a point on the terminal side of angle t in standard position, then co

    Quote Originally Posted by realbrandon View Post
    Cosine is the ratio of adjacent/hypotenuse.

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