233 Answered Questions for the topic Proofs

Proofs Maths

10/02/16

Maths Proof
Show that the product of the first n even positive integers is 2^n(n!)   Apparently you can show this on one single line (which is required)
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04/19/16

10 Very challenging proof: Prove that for every natural number n, cos(nx) can be expressed as a polynomial in cos(x) of degree n
Pleas helm me with this. Its a practice problem, and I do not know how to do it. Thanks!
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03/03/16

Let A be a 3x3 matrix...Can't figure out proof for my linear algebra homework
      (a11 a12 a13) A= (a21  a22 a23)      (a31  a32  a33) and let C1 C2 C3 be the first, second, and third column respectively (counting from the left) of A.                  [x1] A. Let X=... more
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02/05/16

Prove Statement using the First Principle of Mathematical Induction
Prove the following statements using the First Principle of Mathematical Induction:(a) If r ≠ 1, then1 + r + r2 + ... + rn = (1 − rn+1)/(1-r) for all n ∈ N. Why does the formula not work when r =... more
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01/20/16

please help me sap with this calculus proof with differentiation
performing any differentiation with a calculator that can determine gradient functions, show that for an isosceles triangle of fixed perimeter to have a maximum are the triangle needs to be... more
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Proofs

01/09/16

Give segment ae is congruent to ce, segment ab is congruent to segment cd, and e is the midpoint of segment bd. Prove triangle eab is congruent to triangle ecd
The triangles are iscoles.
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12/21/15

Please prove that cot A + cot B + cot C = (a^2 + b^2 + c^2)/(4(area of triangle ABC)).
I need help with this proof. Please help me. 
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11/17/15

If a quadrilateral has one pair of opposite congruent sides and one pair of opposite congruent angles why does that not prove that it is a parallelogram?
please answer quickly!!!!
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11/10/15

Prove: (secx+tanx)^3(secx-tanx)^4=1-sinx/cosx
Prove: (secx+tanx)^3(secx-tanx)^4=1-sinx/cosx   Please show the steps and prove this by making both sides equivalent to each other.  Also, please include which identities follow with each step! :)
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10/27/15

Prove : coth^2 - 1 = csch^2x
Prove : coth2 (x) - 1 = csc2 (x)   cosh2                           1 ____    -   1    =   ________   sinh2                         sinh2     Then I substituted in the definitions of sinh... more
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Proofs

10/02/15

GIVEN<MLN=<OLP PROVE <MLO=<NLP
help me on proofs 
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Proofs

09/16/15

two column angle proofs
GIVEN-Angle 1and angle 2 form a linear pair Measurement of angle 2 + measurement of angle 3 + measurement of angle 4 = 180   PROVE-measurement of angle 1 = measurement of angle 3 + measurement... more
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07/22/15

Geometry Proof Help
I need someone to check my work please. --- Complete the proof by filling in the missing reasons. Given: CB is perpendicular to BD, DE is perpendicular to EC, CB = DE Prove: Triangle DBC =... more
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03/29/15

what does the angles of a reactagle equal when split up into for trianglular regions
If angle EDC is 32° and E is the midpoint of all the sides what is the measures of all other angles.   Thank you!
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03/29/15

Can you solve this proof
Given: angle ABE is congruent to angle CDF Segment AD is congruent to segment BF   Prove: CD is a perpendicular bisector 
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03/29/15

Can you solve my proof
Given: segment DE is parallel to segment BC H is the midpoint of segment DF and segment AB I is the midpoint of segment AF   Prove: triangle ABC is congruent to triangle DFE
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Proofs Math Proofs

02/13/15

How to prove that there is no r in the rationals such that r^2 = 6
 Can someone help me write a full proof for this
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Proofs

02/04/15

Speed, velocity and acceleration proof
Show that, if an object is moving on a straight line, then its speed is increasing when its velocity v and itsacceleration a have the same sign, and its speed is decreasing when v and a have... more
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Proofs

01/19/15

Given: ABCD AD=BC and AB=DC Prove: ABCD is a parallelogram
Given: ABCD, AD≅BC and AB≅DC  Prove: ABCD is a parallelogram    
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Proofs Geometry

01/15/15

Two Column proofs
Given:?XYZ ≅ ZWX   Prove WXYZ is a parallelogram
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Proofs

01/13/15

use the definition of a parallelogram to show that the quadrilateral with vertices A(-4,4), B(-2,0), C(6,4), and D(4,8) is a parallelogram.
how do you solve this as a proof?
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Proofs Geometry

11/24/14

proof with extra step
I have a test tomorrow and I still don't know how to write a proof. I know the basis (first step is given) but from there its basically Portuguese to me ! I know CPCTC but I don't know the steps in... more
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10/26/14

"If 2x-7=4 then 5.5=x" How do you put that in a 2 column proof?
 I can start it out but after the first one im lost. I know the statement for the first one is 2x-7=4, then 5.5=x, and I know the first reason is given but after that im totally confused, and cant... more
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Proofs

10/10/14

whats the proof to this?
Given:  ∠5 and ∠6 are complementary; ∠7 and ∠8 are complementary; ∠5 ≅ ∠7   Prove:  ∠6 ≅ ∠8
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Proofs

08/27/14

Let (A,?A) and (B,?B) be partially ordered sets. Define C = A × B and define the relation ? on C by (a,b) ? (a',b') ?? (a ?A a')?(b ?B b').
Let (A,?A) and (B,?B) be partially ordered sets. Define C = A × B and define the relation ? on C by (a,b) ? (a',b') ?? (a ?A a')?(b ?B b'). (a) Prove that ?' is a partial order on C. (b) Prove that... more
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