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#176 Re: Help Me ! » math » 2013-02-15 18:36:14

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You're welcome

#177 Re: Help Me ! » math » 2013-02-15 16:34:36

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If a polynomial's leading coefficient is 1 and one of it's root is r then (x-r) is a factor of the polynomial,can you solve the problem now?

#178 Help Me ! » P-norm » 2013-02-15 14:29:20

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Replies: 5

The p-norm of a vector(in 2d) is (|x|^p+|y|^p)^(1/p) my question is can p be 0,fraction or nagetive?

#179 Re: Help Me ! » Sum and difference of sine and cosine » 2013-02-15 00:08:03

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Yeah,thanks you helped me a lot in this post.

#180 Re: Help Me ! » Sum and difference of sine and cosine » 2013-02-14 22:33:24

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Quick question:are these formulas used to find half angle formulas?

#181 Re: Help Me ! » test question » 2013-02-14 18:44:36

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% symbol is just 1/100.so,if you change % into 1/100 and multiply,you will get the fraction

#182 Re: Help Me ! » Sum and difference of sine and cosine » 2013-02-14 13:03:29

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Hi bob. I have derived the cosine's sum formula,and after trying a little i found the difference formulas too:),plus i know how to derive tangent's formula using sine and cosine

#183 Re: Help Me ! » Sum and difference of sine and cosine » 2013-02-14 04:41:28

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Thanks for your help,now i'm going to try to derive the cosine formula(thanks again).

#184 Re: Help Me ! » Sum and difference of sine and cosine » 2013-02-14 00:29:37

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Sorry,I got confused with names of formulas(my mother-tongue isn't english smile )amd wrote wrong,I wanted to derive the compound angle formulas using trigonometry.

#185 Help Me ! » Sum and difference of sine and cosine » 2013-02-13 21:41:07

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Replies: 16

How can I derive sum and difference identities of sine and cosine using trigonometry?

#186 Re: Introductions » Hello! » 2013-02-11 13:23:40

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I meant,if first derivative is 0 and second derivative is -ve the point is local mamimum.Also if 2nd derivative is -ve for any x,y and z between them,(z,f(z)) is over the secant line of (x,f(x)) and (y,f(y)).

#187 Introductions » Hello! » 2013-02-11 04:51:29

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Replies: 5

Hello,I am a new user.I am a curious boy,if I see something new I try to learn about it.I intend to learn and help about math from this forum,thank you for your time.May all your lives' second differential be negative.

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