Search found 132 matches

Go to advanced search

by FWT
Mon Jan 18, 2016 6:17 pm
Forum: Trigonometry
Topic: Prove Trigonometric Identities
Replies: 1
Views: 86

Re: Prove Trigonometric Identities

Could you help me to Prove this : SIN + COS = SIN/1-COT + COS/1-TAN It can't be proved as written. Without the args of each of the trig functions we don't even know what they're asking about. Also your RHS means this: \dfrac{\sin()}{1}\, -\, \cot()\, +\, \dfrac{\cos()}{1}\, ...
by FWT
Sat Dec 19, 2015 12:03 am
Forum: Matrix (Linear) Algebra
Topic: Find basis and dimension of a vector space
Replies: 4
Views: 210

Re: Find basis and dimension of a vector space

R_4\, is the same notation for \,R^4 But you said other things in other places. Like here you say: \mathbb{R}_4(x)\, is the set of polynomials with a degree not larger than 4. You said something similar here . You were kind-of told here that R 4 would be mapped onto poly's if they were only...
by FWT
Fri Dec 18, 2015 11:21 pm
Forum: Trigonometry
Topic: Please help me with this problem...
Replies: 2
Views: 111

Re: Please help me with this problem...

2sec x+8=0 here's what i have so far: 2sec x=-8 sec x = -4 cos x = -1/4 x= arccos (-1/4) ---this is where i'm stuck--- i can get the answer in degree mode but i need it/them in radian mode and it's driving me crazy!!! thank you! Doesn't your calculator say how to convert to radian mode? If you lost...
by FWT
Sat Dec 12, 2015 5:51 pm
Forum: Beginning Algebra
Topic: Need help with factoring (x^2+xy+y^2)(x^2+y^2)(x-y)^2(x+y)
Replies: 1
Views: 274

Re: Need help with factoring (x^2+xy+y^2)(x^2+y^2)(x-y)^2(x+y)

schwarzechild wrote:I am a bit rusty with factoring polynomials. Any help would be appreciated with the following problem.

(x2+xy+y2)(x2+y2)(x-y)2(x+y)

I don't know what you started with so I can't say if you did it right but what you've shown is fully factored.
by FWT
Tue Nov 03, 2015 1:26 pm
Forum: Uncategorized
Topic: 7,7,7,7
Replies: 4
Views: 260

Re: 7,7,7,7

Wow. I never would have found either of these. Do you play with these a lot? Maybe they've be good exercise for me.
by FWT
Tue Nov 03, 2015 12:13 am
Forum: Intermediate Algebra
Topic: Writing rational expression in lowest term; help
Replies: 3
Views: 396

Re: Writing rational expression in lowest term; help

\dfrac{a^3\, +\, b^3}{a\, +\, b} Answer is supposed to be a^2\, -\, ab\, +\, b^2 Can anyone explain how to solve this? They're expecting you to remember the special-factoring formula for the sum or difference of cubes. You can find those here . If you apply the sum-of-cubes formula to the top, then...
by FWT
Wed Oct 07, 2015 4:26 pm
Forum: Beginning Algebra
Topic: Discrete-Time Function
Replies: 4
Views: 532

Re: Discrete-Time Function

I can write x(n) = u(n) - u(n-4), where u(n) is the unit step function. This this right? n = -5: u(-5) - u(-5 - 4) = u(-5) - u(-9) = 0 - 0 = 0 thru: n = -1: u(-1) - u(-1 - 4) = u(-1) - u(-5) = 0 - 0 = 0 These are right, but: n = 0: u(0) - u(0 - 4) = u(0) - u(-4) = 1/2 - 0 = 1/2 n = 1: u(1) - u(1 - ...
by FWT
Tue Sep 29, 2015 1:26 pm
Forum: Uncategorized
Topic: Question
Replies: 4
Views: 335

Re: Question

Alfred wrote:What does this mean: >i

It probably depends on the context. Where did you see this?
by FWT
Mon Sep 14, 2015 11:11 am
Forum: Intermediate Algebra
Topic: Linear Programming quiz questions
Replies: 2
Views: 497

Re: Linear Programming quiz questions

E. What is the maximum number of extreme points of a feasible region with only one constraint excluding the nonnegativity constraint? My solution: I said that the maximum number of extreme points will not exist because if there is no nonnegativity constraint there is no x and y axes. When they say ...
by FWT
Thu Aug 06, 2015 3:51 pm
Forum: Uncategorized
Topic: making cubes
Replies: 7
Views: 642

Re: making cubes

Added information: If a cube can be obtained by rotating another cube, these two cubes are NOT considered to be different. So the other reply was right about what to assume. Thanks for that. My 27 is wrong. How do you know? What was your reasoning? My reasoning would start by doing one half (or &qu...

Go to advanced search