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Math Help - Explain Sin, Cos, and Tan of 0 degrees

  1. #1
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    Explain Sin, Cos, and Tan of 0 degrees

    Hi, is it possible for someone to explain to me why the sin, cos and tan of 0 degrees is 0, 1 and 0 degrees respectively. I am a visual learner, and i just can't get my head around the concept.

    Inaddition i would also like to understand why the sin cos and tan of 90 degrees is 1 degree, 0 and undefined.

    Thanks in advance, =]
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  2. #2
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    definitions you need to know ...

    \sin{\theta}= \frac{y}{r}

    \cos{\theta}= \frac{x}{r}

    \tan{\theta} = \frac{y}{x}

    the ray where \theta = 0 intersects the unit circle at the coordinates (1,0), i.e. , x = 1 and y = 0.

    substitute the values of each coordinate into the definitions ... what do you get?
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