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which pythagorean identities do you know ?

I've bee through all except for the half identities

so which identity relates tan^2 A and sec^2 A ?

Sin?

I mean cos?

ever sen this ?
\(\\tan^2 A =sec^2A-1\)
?
use it here

Yes. I'm familiar with that
Wait. Let me try

I got 2x^2+3x-2
Is it right?
So i may move on

yes,
that = 0
remember its an equation, not an expression

Oh right

How'll this be nothing will equal to 3x?

what ? i didn't get your question...

2x^2+3x-2 = 0
x= .....
x=....

Oh sorry
What i meant was what should i do next?
How do i find x?
I cant use the FOIL method.

factor method.
2 numbers with sum = +3 and product = -4

Got it
Wait

sec A can be -2

I dont see any negative 2 in the graph list
Sec A =-2

sec A = -2
secA = 1/cos A
cos A = -1/2
when ?

I dont see any cos A =-1/2
There is only cos A=1/2

Or did i get it wrong?

how about angles 120 and 210 ?

Where did you get that.
Those arent in the graph that was given to us

http://en.wikipedia.org/wiki/File:Unit_circle_angles_color.svg

Oh i see now
So will the answer for secA=-2 or cosA=-1/2 be:
A={120,210}

Okay thanks again

welcome ^_^