tesia
Dec 15, 2009, 04:21 PM
I'm in Pre-AP Pre-Cal and we have a chart of many of the Trig Identities but I'm lost. We are suppost to simplify expressions. That wasn't easy but I understand it occasionally but then today we were told to "Verify" Trig Identities. Lost. For example...
QUESTION: Cosx + Sinxtanx = SecX
I'll type my work so far but I start to go no where.. and I'm going to drop the x because it can't change and it's simpler to type without it
Cos + ((sin/1)(sin/cos)) = sec
Cos + Sin^2/cos = sec
cos + (1 - cos^2)/cos = sec
cos +(1/cos) - (cos^2/cos) = sec
cos + (1/cos) - (cos/1) = sec
... then I go now where... all that may be wrong, I'm not sure. I just need help understand. When they have two things next to each other to multiply them such as "sinxtanx".. I don't understand what to do what so ever. I just kind of go with it and hope I'm right.
QUESTION: Cosx + Sinxtanx = SecX
I'll type my work so far but I start to go no where.. and I'm going to drop the x because it can't change and it's simpler to type without it
Cos + ((sin/1)(sin/cos)) = sec
Cos + Sin^2/cos = sec
cos + (1 - cos^2)/cos = sec
cos +(1/cos) - (cos^2/cos) = sec
cos + (1/cos) - (cos/1) = sec
... then I go now where... all that may be wrong, I'm not sure. I just need help understand. When they have two things next to each other to multiply them such as "sinxtanx".. I don't understand what to do what so ever. I just kind of go with it and hope I'm right.