Trigonometry Definition and 664 Threads

find the angle x if its known that: sin(x/2) = 1/2 tan(x)=sqrt(3) 0<=x<=360

Well, does anyone know how to solve for an angle of a triangle if you already have the measurements of all three sides? Any help would be appreciated.

How do I do this? Thanks.

hello everyone, well my story is a bit complicated.. since I've entered school i was french educated, now I'm in my last year and I'm moving to an english school and I'm in the field GS (general sciences) the reason for moving schools is that I'm traveling to Canada next year to study...

Hey everyone, I was looking over some old pre-calculus exams and I found this rather obscure looking question.. It's about trigonometry. You're given a triangle ABC, and the legs are a (BC),b (AC), c (AB). You're given the lenghts of a=5, b-8, and the angle C between them is 140. The...

Hello all In my textbook I encountered the following problem: Find the six trigonometric values of cos^ -1 (3/7). They must be exact. I gather what they mean is that I find arccos (3/7). I tried applying basic identities, but didn't work. Any help would be appreciated. Thanks

I can do pretty much all the proofs except these two, though I've tried to make a start. Note that in the questions the angle is given as theta, but for the sake of my keyboard I've changed it to angle 'x'. Q15: Prove: Tan2xsecx = 2sinxsec2x. So I need to show the two sides are equal...

in triangle PQR, PQ = a, QR = a + d, RP = a + 2d, and angle PQR is more than 120 degree., where a and d are positive constants. show that 2a/3 < d < a. i tried to think, but i really don't know how to start to solve this question. hope for some clue. thank you

Hi all, I'm a newbie here and sorry for my bad English. I want to share with you guys 2 formulas I've created luckily on a boring day: 1) Let R be circumscribed circle of triangle ABC, let S be it's area. We have: S=2R^2*sinAsinBsinC 2)Let S be area of triangle ABC, a=BC, b=CA, c=AB. We...

Yes it is me again. :D Now with a trig problem XD I was doing some problems on my homework in math, Trigonometry and I had problems proving this proof: 1+ cos Ө = csc Ө + cot Ө I've worked it out until I simplified the right side to: sin Ө ----- 1+ cos Ө And then I realized...

In the figure, EA=EB=EC and AB = 200 m. Angle BCA = 30 degrees. Find angle AEB. Anyone can help me?

help with some trigonometry problems please! hello everybody! how's everyone doing? i hope you guys are well and your homework is going great! i posted another help thread but it was in the wrong section! sorry! but i got great help there! :smile: :smile: ok here's my new problem. i tried...

I've added a picture that's part of the problem. A sailboat race course consists of four legs defined by the displacement vectors A, B, C and D shown above. The values of the angles are È1 = 420, È2 = 410, and È3 = 270. The magnitudes of the first three vectors are A = 3.7 km, B = 5.3 km...

Anyways as I said, I put myself in a Trigonometry class. I got into this Continued Learning Program at a Small College in which they will let me take Trigonometry and I will not get any Credits from it, therefore they will not put this class in my School Records. I am basically taking it on my...