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April 2, 2015

April 2, 2015

Posted by **joy** on Tuesday, December 28, 2010 at 11:24pm.

- trig -
**TutorCat**, Wednesday, December 29, 2010 at 12:30amplot (0,0), (-1,0), (0,4) and connect the dots

http://www.mathsisfun.com/sine-cosine-tangent.html

- trig -
**Henry**, Wednesday, December 29, 2010 at 5:54pm(0 , 0), (-1 , 4).

X = -1 - 0 = -1.

Y = 4 - 0 = 4.

r^2 = X^2 + Y^2,

r^2 = (-1)^2 + 4^2 = 17,

r = sqrt(17).

sin(Theta) = Y/r = 4 / sqrt(17) =

4*sqrt(17) / 17.

cos(Theta) = X/r = -1/sqrt(17) =

-1*sqrt(17) / 17.

tan(Theta) = Y/X = 4 / -1 = -4.

csc(Theta) = 1/sin(Theta) = 17 / 4*sqrt(17) = 17*sqrt(17) / 4*17 =

sqrt(17) / 4.

sec(Theta) = r/X = 1/cos(Theta) =

17 / -1*sqrt(17) = -17*sqrt(17) / 17

= -1*sqrt(17).

cot(Theta) = 1/tan(Theta) = X/Y =

-1/4 = -(1/4).

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