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karatechopper

  • one year ago

Can someone please check a trig function worksheet for me? I'm practicing! :)

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  1. lfreeman1285
    • one year ago
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    I might be able to help!

  2. karatechopper
    • one year ago
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    Thanks! @IFreeman1285

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  3. Nnesha
    • one year ago
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    https://www.mathsisfun.com/geometry/images/circle-unit-304560.gif :=)

  4. Loser66
    • one year ago
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    WWWWWWWWWWWWWooooooooooooooooah!! you memorize all of them??? A/MA/Zing

  5. karatechopper
    • one year ago
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    Didn't memorize! I use the hand method. :)

  6. Loser66
    • one year ago
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    teach me, please

  7. lfreeman1285
    • one year ago
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    memorizing them isn't incredibly difficult, I had to for precalculus. These look correct! I didn't find any mistakes in my quick glance. I'll continue looking though.

  8. karatechopper
    • one year ago
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    So basically each finger on the hand has a different angle. Thumb-90 Index-60 Middle-45 Ring-30 Thumb-0 The palm is always 2. On top= cosine (side where the thumb points up) On bottom=sine (side where the pinky finger is) Say for example we are given the problem find Cos(pi/6) We know that pi/6 is a 30 degree angle, thus we put our ring finger down. We also can tell from the unit circle that when cos is pi/6, cos is positive. We put our ring finger down and then see that we have up on the cosine side above the folded finger. We have 3 fingers (ON TOP-COSINE) Now, anytime we look at the fingers, we need to square root them. So we say sqrt of 3, and then we put the value above the 2 in the palm bc this isn't Tangent or Cotangent where we have to look at both Sine and Cosine. Therefore, the answer for cos(pi/6) is sqrt3/2. Make sense? :)

  9. karatechopper
    • one year ago
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    Thank you free man! Yeah this is a precalc review for a calc quiz I'm taking tomorrow haha.

  10. karatechopper
    • one year ago
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    @Loser66 there's an explanation example for the hand method I use.

  11. Loser66
    • one year ago
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    Thank you.

  12. lfreeman1285
    • one year ago
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    it looks like you're going to do well on that quiz then haha

  13. karatechopper
    • one year ago
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    I would hope so! Are they all correct? The quiz tomorrow is timed and I have a lot of other tests/discussions, and work in school tomorrow. I hope I'm not worn out by the time I get to this quiz! :) .

  14. Nnesha
    • one year ago
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    tan 120 is it -sqrt{3} or positive ?

  15. lfreeman1285
    • one year ago
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    It's negative, because its in the second quadrant.

  16. Nnesha
    • one year ago
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    http://prntscr.com/8at9tn looks like square root tan isn't positive in 2nd q

  17. Nnesha
    • one year ago
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    no i mean on the worksheet :) there is just sqrt{3}

  18. lfreeman1285
    • one year ago
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    Tangents are negative in the second and fourth. Cosines are negative in the second and third. Sines are negative in the third and fourth.

  19. lfreeman1285
    • one year ago
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    So just being careful about which quadrant everything is in should help. Drawing the circle at the top of the test is what helped me.

  20. Nnesha
    • one year ago
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    yes i know.

  21. Nnesha
    • one year ago
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    that question was for kara :D

  22. karatechopper
    • one year ago
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    Thanks!!!

  23. karatechopper
    • one year ago
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    Help a lot guys!

  24. karatechopper
    • one year ago
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    Have a good day/night everyone! :) x

  25. Nnesha
    • one year ago
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    csc =1/sin so\[\huge\rm csc(\frac{ 7\pi }{ 6 })=\frac{ 1 }{ \frac{ -1 }{ 2 } }\]

  26. karatechopper
    • one year ago
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    -2!

  27. Nnesha
    • one year ago
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    yes there is -1/2 on the wrkshet

  28. karatechopper
    • one year ago
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    Lol yeah I just saw that haha. Fixed, thank you! :) x

  29. Nnesha
    • one year ago
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    11) sec 180 is wrong there is no way you can get 1 for sec tan can be one

  30. Nnesha
    • one year ago
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    good job :) 3 mistakes i guess typoz :D tan 120 sec 180 csc (7pi/6) :=)

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