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Help the next generation of students in the community for the new syllabus!
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Drongoski's latest activity
D
Drongoski
replied to the thread
Logic - negation
.
You put up the post. I was surprised. I did not think it is in 4U. Have to check the new syllabus again.
Today at 10:47 AM
D
Drongoski
replied to the thread
Logic - negation
.
Truth Table p q p => q Not(p => q) T T T F T F F T F...
Yesterday at 10:09 PM
D
Drongoski
replied to the thread
Which tutoring centers are best for these subjects?
.
Tutoring costs a lot of money. If you can cut down on a few subjects, you'll save your parents heaps. Also, if you were to do tutoring...
Yesterday at 2:01 PM
D
Drongoski
replied to the thread
Which tutoring centers are best for these subjects?
.
Your parents must be very rich
Yesterday at 11:06 AM
D
Drongoski
reacted to
fan96's post
in the thread
Trig question 3U
with
Like
.
Rewriting (and using \sin 2x = 2 \sin x \cos x), we have ( 3 \sin \theta - 4 \sin^3\theta) + 2 \sin \theta \cos \theta = \sin \theta...
Thursday at 7:57 AM
D
Drongoski
left a message on
ydog
's profile.
If you can come to Epping, I can do Ext 1 for $95/lesson (1.5 hrs). I can explain difficult concepts better than most teachers. I've...
Nov 7, 2019
D
Drongoski
reacted to
avatarfahaad's post
in the thread
3U Maths HSC 2019 Solutions
with
Like
.
So I was bored and I decided to do the HSC 3U Maths for 2019. Please tell me if any of the answers are wrong. I am not a HSC student...
Nov 7, 2019
D
Drongoski
replied to the thread
Non-English speaking background
.
But please read (well-written material, good books, old & new) widely, and, critically.
Nov 7, 2019
D
Drongoski
replied to the thread
Non-English speaking background
.
I'm sure there are many many from non-English speaking background who do extremely well in their English. Just because you speak...
Nov 7, 2019
D
Drongoski
replied to the thread
3U Maths HSC 2019 Solutions
.
\int \frac{sin 2x}{4+cos^2 x} dx =\int \frac {sin 2x}{4 + \frac{1}{2} (1 + cos 2x)}dx = \int \frac {2sin 2x}{9 + cos 2x}dx \\ \\ = \int...
Nov 5, 2019
D
Drongoski
reacted to
Arrowshaft's post
in the thread
Square root of complex numbers... I need... help...
with
Like
.
I'm gonna teach you the 'normal' way of doing it, Drongoski showed you the shortcut, I'm building off of Psmao's method. So, we are...
Nov 3, 2019
D
Drongoski
replied to the thread
Square root of complex numbers... I need... help...
.
I didn't mean to criticise your method. It is, after all, the standard method. But for simple cases, the "Terry Lee" method is really...
Nov 3, 2019
D
Drongoski
replied to the thread
Square root of complex numbers... I need... help...
.
Well - you can compare the "normal" method with the "abnormal" method. If you can manage the shorter method, would you want to go...
Nov 3, 2019
D
Drongoski
replied to the thread
Square root of complex numbers... I need... help...
.
-5 + 12i = 4 + 2 \times 2 \times 3i -9 = 2^2 + 2\times 2 \times 3i + (3i)^2 = (2 + 3i)^2 \\ \\ \therefore \sqrt {-5 + 12i} = \pm(2 +...
Nov 2, 2019
D
Drongoski
replied to the thread
Square root of complex numbers... I need... help...
.
I like the method in Terry Lee's text: z^2 = 2 - \sqrt 5 i = \frac {1}{2}(4 - 2\sqrt 5 i) = \frac {1}{2}(5 - 2\sqrt 5 i -1) \\ \\ =...
Nov 2, 2019
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