Use your head

[Beeesneees]

Neither of those, because sentences need a capital letter at the beginning and a full stop at the end.
Other than that, they may both be considered to be correct. Personally I would use 'in', but being British I wouldn't say 'math'.
_________________
Cheers m' dears!

[Aminhanan]

Thanks for your answer.

[Frankvac]

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Please listen to my recording and respond with a voice message too. Many thanks.

[Wijithbanda]

Thanks , Very important

[Faliery]

Hi all,
->Morteza I agree with your comments but not really your qualification to Alan saying that he is "l'homme de tête" parce pour moi un l'homme de tête est quelqu'un qui sait tous et maîtrise tous i.e Alan est très fort avec son "essay" mais peut être pas avec d'autre domaine. Anyway, I really appreciate his essay and also reading all the comments that all the member did.
Thanks,
Faliery

[Prithvi1963]

Respected Alan sir.
Your essay is describes use &,importance of head & tail very nicely but some words are very difficult for newly english learner!!!
Thanks

[Flyashko]

Good essay, I'm glad to read one more:-)

Best regards,

Miroslav

[Catherine Tan]

Hi Alan,

I am totally amazed at the using of the word "head" in the English language. I love reading your essays and I try using those words that I learned through the English-Test.

Thank you.

Catherine Tan

[Aftab.rasheed]

Dear Alan,

You are doing superb job.