Why do digits add down to 9? | Free Math Help Forum

Why do digits add down to 9? | Free Math Help Forum

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Why do digits add down to 9? | Free Math Help Forum

7 Aug 2013 ... Unfortunately, the author gives no explanation as to _why_ this works -- or is it too obvious for me to see? And how does the first principle give ...

the digits of Pi - Math.com

In 1882 Lindeman proved that Pi was transcendental, that is, that Pi is not the root of any algebraic equation with rational coefficients. This discovery proved that ...

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Concave Down and Increasing? | Free Math Help Forum

I set f'' equal to zero and got x=.25. Also, I believe it is undefined at 0? Would the answer be C? I'm not sure where to go from here if it's not.

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Mobius Strip as Source of Infinity Symbol? - Math Forum - Ask Dr. Math

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Inverse Sine of a Value Greater than One - Math Forum - Ask Dr. Math

22 Dec 2003 ... As the angles change, the sine of the angle goes up and down, but it never goes above 1 ... The inverse sine or arcsin of 1.732 does not exist.

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Ask Dr. Math FAQ: About Pi - The Math Forum

Pi is always the same number, no matter which circle you use to compute it. ... If you write pi down in decimal form, the numbers to the right of the 0 never repeat ...

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Derivative of a Polynomial - Free Math Help

The second term is 6x 6 x . Since the exponent of x is implied to be 1, we can bring that down and multiply, which does not change the coefficient. Reducing the ...

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