Recent content by mitaka90

I'll check it out. It turned out that it was indeed a minus sign. I got some points from the beginning of the problem and I managed to get the A or Excellent mark. I don't really know why I messed it up, but whatevs. Job's done!

I see, I might've forgotten that there was a minus sign. Then everything comes as clear as a day. Whew. Ty all! btw, What kind of calculator did you use greg?

What? Really? I'm pretty sure that it was like this. I guess I'm going to have to wait until my math teacher gives the term test back and see what she has to say. Or I might have remembered the identity incorrectly. I'll update this thread on Monday hopefully if she returns the term test...

I got this problem on my term test and it's the first problem I couldn't solve on a test ever since I'm in High School. I've tried to solve it at home even, but I still couldn't manage. The thing is that it doesn't even look difficult, maybe there's something I'm not seeing, so I hope someone...

I believe I can explain it well, because tbh is quite easy to understand if you check out my way. The simplest thing you could've done is to express the total length of the string. You can use any letter you want, but usually l stands for length in Maths as Mark has used. \ell=

Omg, I'm such a moron. I hate it when I do the hard work and then the easiest and most noticable thing just slips from my sight. Thank you sincerely, I guess that little tip is what I needed.

a1, a2, a3 and 4 make an arithmetic progression with difference d. For which values of d, A = a1a2 + a2a3 + a3a1 has the lowest value?I don't know if I went with the right approach, but I managed to get this : A=3x2 +6xd + 2d2 for a1= x, a2 = x + d, etc... But I don't know what else to do.

Yep, pretty straight forward from here. I can't believe how I couldn't work out that there would be some trigonometric functions stuff going on, specifically law of sines, because of the square root in the answer and the angles in the actual problem, lol. Thanks a lot! :) Btw, feel free to...

I have no idea how to solve this problem. ABCD is just an irregular Quadrilateral so nothing too special with that figure. We are looking for the ratio BC:CD and we only have that two angles. I know that the answer is 1:√2, but I have no idea how to find it.