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Maths Trigonometry

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astarmathsandphysics:
This is the way I teach to solve eaquations like
sinx=0.4
x=sin-10.4=23.58
Then the other solutions are

180-23.58, 360+23.58, 540-23.58, 720+23.58, 900-23.58,1080+23.58 etc

See the pattern?
cosx=0.4
x=cos-10.4=66.42
Then the other answers are

306-66.42, 360+66.42, 720-66.42, 720+66.42, 1080-66.42, 1080+66.42 etc

Again the pattern

To solve tanx=0.4
x=tan-10.4=21.80

then the other answers are180+21.8, 360+21.8, 540+21.8, 720+21.8, 900+21.8 etc

SGVaibhav:
basically i find the circle thingy hard in the beginning itself, the radian thingy, i understood whats pi and stuff.

but i get confused with questions, such as that on page 63
question 2) 2cos(t)=..........

like i understood identities

there r few things which r hard, but the hardest thing for me is the unit circle and the items associated with it.
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yes nid u got it what i find hard, plz try to find some nice vids

nid404:
check this http://www.youtube.com/watch?v=9zspW8u6kQM

SGVaibhav:
hey nid, thanks for the vid, it was very good, but i understood that part.

hmmm
look at this link
http://upload.wikimedia.org/wikipedia/commons/c/c9/Unit_circle_angles.svg
its a unit circle.

i will tell what i know and what i dont :D :P

now i know the radian thingy (pi/2) and stuff
i know the degrees thingy (45deg), lol just to clarify
now those 4 lines should be the X and Y axes.
i dont know the use of (0,1) and (1,0) over here  (is it to show quadrants??)
now what is this (1/2 , (?2)/2) -- written over all angles

__________________________________
so u all know what i dont understand now (lol)
if u could explain in text, its not a prob, because i dont need a vid for this part atleast :D
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slvri had understood this part by the quadrants method, if someone could tell that also, it would be great :D

nid404:
okay you figured that right....the x and y coordinates tell you abt the quadrant and well the values you spoke about are also coordinates of the points on the circle(which lie in different quadrants)...

for example
for 30degrees or pi/6 radians....the coordinate for this circle(with radius 1 unit) is ( root3/2, 1/2)...which means that the x coordinate is root3/2 and y coordinate is 1/2
I hope you got it..if some1 can explain it in a better way, it would suit vaibhav

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