Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**q8boy****Guest**

can someone solve this for me?

dy/dx = 2tanx + 2xsec²x

find the gradient at x = pi/4

**q8boy****Guest**

i get the 2tanx = 2 but 2pi/4(sec²pi/4) = ??

**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

*Last edited by Daniel123 (2008-03-16 04:29:00)*

Offline

**LuisRodg****Real Member**- Registered: 2007-10-23
- Posts: 322

Finding the gradient just means finding the slope or the value of the derivative (dy/dx) at the specified x value.

So if you have:

This is the same as just plugging in the x:

*Last edited by LuisRodg (2008-03-16 04:02:03)*

Offline

**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

Luis, you need to use lower case \pi.

Offline

**LuisRodg****Real Member**- Registered: 2007-10-23
- Posts: 322

Thanks Daniel. I *always* have problems with this latex lol!

Offline

**q8boy****Guest**

thanks guys

**LuisRodg****Real Member**- Registered: 2007-10-23
- Posts: 322

No problem.

What is this "a-level" you put in the topic?

Offline

**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

British Secondary School (High School) System:

AS and A level are two different levels of qualifications. They are completed in the last two years of Secondary School, before University.

Generally,

Ages 16-17: AS level

Ages 17-18: A level

Students usually choose 4 AS level subjects, and then the same 4 (or they often drop one and take 3 of the 4) for A level.

*Last edited by Daniel123 (2008-03-16 04:46:03)*

Offline

**LuisRodg****Real Member**- Registered: 2007-10-23
- Posts: 322

Does this constitute an "Advanced" program or is this the general educational setup for everyone?

I live in the US, and back when I was in High School I was part of the IB program (International Baccalaureate) which in fact is an European program and it had a similar setup in the sense that you chose 3 HL (Higher Level) and 3 SL (Standard Level) classes. But this was in the same year.

*Last edited by LuisRodg (2008-03-16 04:55:45)*

Offline

**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

Yes, AS stands for "Advanced Subsidiary", and A for "Advanced".

Students are not required (yet) to stay in school to do these qualifications.

Offline

**Daniel123****Member**- Registered: 2007-05-23
- Posts: 663

Out if interest, do you pronounce your name "loois" or "looeey"?

Offline

**LuisRodg****Real Member**- Registered: 2007-10-23
- Posts: 322

"loois"

Offline

**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 826

Daniel123 wrote:

Out if interest, do you pronounce your name "loois" or "looeey"?

"Luis" can be pronounced as "Looeey"?

Offline

Pages: **1**