Question

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

Answer 1

I might be able to help!

Answer 2

Thanks! @IFreeman1285

Answer 3

https://www.mathsisfun.com/geometry/images/circle-unit-304560.gif :=)

Answer 4

WWWWWWWWWWWWWooooooooooooooooah!! you memorize all of them??? A/MA/Zing

Answer 5

Didn't memorize! I use the hand method. :)

Answer 6

teach me, please

Answer 7

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.

Answer 8

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? :)

Answer 9

Thank you free man! Yeah this is a precalc review for a calc quiz I'm taking tomorrow haha.

Answer 10

@Loser66 there's an explanation example for the hand method I use.

Answer 11

Thank you.

Answer 12

it looks like you're going to do well on that quiz then haha

Answer 13

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! :) .

Answer 14

tan 120 is it -sqrt{3} or positive ?

Answer 15

It's negative, because its in the second quadrant.

Answer 16

http://prntscr.com/8at9tn looks like square root
tan isn't positive in 2nd q

Answer 17

no i mean on the worksheet
:) there is just sqrt{3}

Answer 18

Tangents are negative in the second and fourth.
Cosines are negative in the second and third.
Sines are negative in the third and fourth.

Answer 19

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.

Answer 20

yes i know.

Answer 21

that question was for kara :D

Answer 22

Thanks!!!

Answer 23

Help a lot guys!

Answer 24

Have a good day/night everyone! :) x

Answer 25

csc =1/sin so\[\huge\rm csc(\frac{ 7\pi }{ 6 })=\frac{ 1 }{ \frac{ -1 }{ 2 } }\]

Answer 26

-2!

Answer 27

yes there is -1/2 on the wrkshet

Answer 28

Lol yeah I just saw that haha. Fixed, thank you! :) x

Answer 29

11) sec 180 is wrong
there is no way you can get 1 for sec
tan can be one

Answer 30

good job :)
3 mistakes i guess typoz :D
tan 120
sec 180
csc (7pi/6) :=)