Question

Help! Will give you a medal and become a fan (:

Answer 1

On a separate piece of paper, sketch a unit circle with angle θ in standard position. Use the circle to answer the following questions:
For what values of θ is the sine increasing? Decreasing?
For what values of θ is the cosine increasing? Decreasing?
For which angle between 0° and 360° is sine equal to 0? Where is cosine equal to 0?

Answer 2

do you have a scientific calculator?

Answer 3

Yeah, but I have no clue how to work it, it is a TI-84 plus

Answer 4

so you have to figure out what angle its at when it starts to increase... make your formula first

Answer 5

Well the angle is going to start at 0 because it is the sine of o. So that must mean that it is going to start increasing as the sine starts going up.

Answer 6

yes. so your formula would be what?

Answer 7

well i am confused with the formula, i know it would have to have the sine in it.

Answer 8

well if it starts at zero, its going to be sine=0x+x

Answer 9

So everytime you go by up by one or some number you plug it in for x?

Answer 10

right

Answer 11

So the equation is sin=0x+x or sin = 0x+ y?

Answer 12

yes so how would you make it when sine is decreasing?

Answer 13

you would change the + to a -

Answer 14

yup

Answer 15

do you think you can finish it?

Answer 16

Yes, but is it the same thing for cosine?

Answer 17

i dont think so i dont know cosine very well.

Answer 18

Ok, i will give it a try! Thanks though for all the help!

Answer 19

sure thing

Answer 20

are you going to have to do more of these kinds of problems?

Answer 21

Umm yeah, but I am not sure what thequestions are

Answer 22

Here is the next question Explain how to use the measures of a right triangle to calculate the exact value of sin 30°? How can this information be used to determine the exact value of sin 60°?

Answer 23

ok well heres some tips :
the equation for unit circle is x^2y^2
sin(t)=y
cos(t)=x
tan(t)=y/x, x is not 0
csc(t)=1/y, y is not 0
sec(t)=1/x, x is not 0
cot(t)=x/y, y is not 0