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**

**unlucky guy****Guest**

my teacher is evil and won't explain everything. he wants brides and stuff like that... he gave only one easy example about trigonometric function and gave 48 exercises as a homework including problems.

please can u help me with this one...

prove that sin t + sec t = tan t is not an identity. and please with little bit more explanation about how you solving

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,720

Hi unlucky guy;

One of the easiest ways is to find an obvious counterexample:

so sec(0) is 1 / 1 because cos(0) is 1.

because

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.****No great discovery was ever made without a bold guess. **

Offline

**unlucky guy****Guest**

thanks

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,720

Hi;

Please let me know what your evil teacher thinks of it. He sounds like a moderator I know on another forum. If they are the same, he will absolutely hate my answer...

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.****No great discovery was ever made without a bold guess. **

Offline

**unlucky guy****Guest**

no he isn't im sure

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 105,720

Hi;

Okay, good luck then and welcome to the forum.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.****No great discovery was ever made without a bold guess. **

Offline

Pages: **1**