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thestudentinneed

  • 3 years ago

what is the sine of -390 in fraction form and how would i find out how to do this on my TI-84 graphing calculator?

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  1. Grazes
    • 3 years ago
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    Make sure the mode is set to degrees and not radians. Enter sin(-390 to find the decimal form. Then, press math and select >Frac. Press enter and you have your fraction

  2. thestudentinneed
    • 3 years ago
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    Thank you so much! helped a lot!

  3. Grazes
    • 3 years ago
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    Tip: Don't depend on your calculator

  4. Grazes
    • 3 years ago
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    It /will/ screw you over.

  5. thestudentinneed
    • 3 years ago
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    Yeah i have the basic points of the unit circle memorized but thats not one of them

  6. Grazes
    • 3 years ago
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    If you can, sketch theta. Remember that sin(k)=y/r, cos(k)=x/r, and tan(k)=y/x

  7. thestudentinneed
    • 3 years ago
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    Oh okay, haven't tried that

  8. thestudentinneed
    • 3 years ago
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    just to make sure I'm correct its (cos,sin) for how the ordered pairs on a nit circle are ordered right?

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