Question

GT please help in Trig

Answer 1

Look at this link:
http://en.wikipedia.org/wiki/Sine

Particularly section "Relation to Unit Circle".

In trignometry, sine and cosine are two basic functions. Their values are defined as ratios of sides of right triangle (formed inside the unit circle) based on various angle measures.

Answer 2

ok..then..

Answer 3

Really, first study that part and ask questions. If you understand this basic point, rest is all bunch of re-arranging and playing with it.

Answer 4

ok

Answer 5

well i do have one question, but its not only a sine question its a cos,sin, and tan question. may i ask?

Answer 6

Ask any question any time.

Answer 7

ok well how do you know if you have to solve for sin, cos, or tan? i see that some questions dont tell you..

Answer 8

In that above triangle
sin(x) = a/c
cos(x) = b/c

In unit circle, c = 1 (radius of that unit circle).

Answer 9

tan is nothing but ratio of "sin and cos"
tan = sin/cos

Answer 10

What function you solve for depends on the triangle's angles and measures in question.

In my triangle above, x is the specific angle in the left bottom. If x was the right top angle, then sin and cos will "flip".

Answer 11

In general:
sin = opposite side of angle / hypotenuse
cos = adjacent side of angle / hypotenuse