Math (alg & Trig)

[pynkgodde55]

I'm taking my placement tests for college and I need a refresher course on these problems:



Trig Functions and Identities-

Which of the following is Equivalent to 1-cos^2O/cos^2O?

A. sec^2O

B. (csc^2O)-1

C. tan^2O

D. sin^2O

E. -(1/sin^2O)



(the O are those circles with the lines through the middle)





Rational Expressions-

For all r does not =2, r^2-5r+6/r^2-4=?

A. r-3/r+2

B. r-2/r+2

C. r-2/r+3

D. r+3/r-2

E. r+3/r+2





Functions-

If f(4)=0 and f(6)=6, which of the following could represent f(x)?

A. 2/3x-4

B. x+2

C. x-4

D. 3/2x+6

E. 3x-12





I really want to do good on my test so I can get into a higher level Algebra class so any help you can provide would really help me out

Thanx!

Jen

[pynkgodde55]

All I need help w/ now is the 1st problem. I got the second two! Woo-hoo!

[Beautiful]

um... i have no idea what that says, is it in a diffrent language? j/k, well i dont think anyone knows what it means either.. im sowie

[padresfan]

I think #1 it's C (tan^2O) because

tan=sin/cos

so

tan^2=sin^2/cos^2

and then

sin^2=1-cos^2

because

sin^2 + cos^2 = 1 (trig identity)---subtract cos^2 from both sides

so

1-cos^2O/cos^2O = tan^2O



Does that make sense. Oh man!, I hope I'm right.

PS--I think what you mean is the circles with the lines through them are the theta symbol.

[XTorn2PiecesLPX]

?!?!?!?!?!?!....Im sorry....Im NO good in math...i hate it with a passion....Ask me about history and ill blow your mind! lol...Sorry for not helping...-Rocket