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**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: 102,304

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.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**unlucky guy****Guest**

thanks

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,304

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.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**unlucky guy****Guest**

no he isn't im sure

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,304

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.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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