#a2 maths

[motivational-study]

31/05/17 // 15:04 I've given up on the aesthetic at the moment as I'm just focusing on doing the work this close to exams! Currently working on the C4 topics I'm not too good at

[motivational-study]

04/06/17 // 17:30 I’m making a few summary flashcards and going through some old past papers for computing, and then I’ll work on a bit of maths!

[theperksofbeingastudier-blog]

7/9/15 And it starts again

[reviseordie]

A few people have asked me how I revise maths when I’m not doing past papers, and this is how! I do summary mindmaps on each chapter- this one’s on vectors.

[reviseordie]

friday night maths 👍

[hothappyhealth-blog]

hahaha that exam was horrific hahaha

[hothappyhealth-blog]

I really don't know how to feel about that exam, it was an easy paper and I know I got lots of questions right but I don't think I've done enough for an A, I nearly had a panic attack in the exam and my mind kept going blank, I'm just worried about getting into uni because I know I've made loads of stupid mistakes and I'm completely fucked for C4 tomorrow.

[lu-fu-nope]

Harmonic Form

Rcos(θ + a) or Rsin(θ + a)

Uses trig angle formulae

Example: 2sin x + 5cos x = Rsin(x + a)

2sin x + 5 cosx = Rsin(x)cos(a) + Rsin(a)cos(x)

Rcos(a) = 2, Rsin(a) = 5; tan(a) = 5/2 --> tan-1(5/2) = 68.2°

R2cos2(x) + R2sin2(x) = 22 + 52 R2(cos2(x) + sin2(x)) = R2(1) =  22 + 52 = 29 R = √29

= √29cos(x + 68.2°)