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by little_dragon
Fri Aug 19, 2016 7:07 pm
Forum: Trigonometry
Topic: Given that ×=tan theta find arcot x in terms of theta
Replies: 1
Views: 103

Re: Given that ×=tan theta find arcot x in terms of theta

Given that × = tan(@), find arcot(x) in terms of @ i'm using "@" for "theta" do the regular placeholder triangle: triangle: . , '| , ' | , ' | x , '@ | *----------------* 1 so tan(@) = x/1 = x every triangle has 180* angle sum & this is a right triangle get an expression in ...
by little_dragon
Thu Jul 28, 2016 3:48 pm
Forum: Uncategorized
Topic: Where to start?
Replies: 1
Views: 258

Re: Where to start?

they should give you a placement test so they start you out where you need to be based on what you remember: http://www.purplemath.com/modules/placment.htm since only you (or a test) can know what you remember only you (or the test) can say where you need to start. you have to go back to whatever yo...
by little_dragon
Mon May 30, 2016 2:18 pm
Forum: Intermediate Algebra
Topic: Graphing calculator resources?
Replies: 1
Views: 331

Re: Graphing calculator resources?

I'm trying to follow along on some of the examples using a TI-84 plus calculator, and I can't get the graphs to come out the same as the examples. Only way I know how to graph quadratic equations is pressing "y=", filling out the equation, and hitting graph. Not sure what to search to eve...
by little_dragon
Fri May 20, 2016 5:27 pm
Forum: Intermediate Algebra
Topic: Work problem
Replies: 1
Views: 268

Re: Work problem

How would I do the following work word problem? they show how here: http://www.purplemath.com/modules/workprob.htm Tom and Sam can finish a plowing job in two hours. Tom working alone can do the job in 7 hours. How long would it take Sam to finish the same job alone? do like they show: hours to com...
by little_dragon
Sat May 07, 2016 1:20 pm
Forum: Matrix (Linear) Algebra
Topic: find rotation matrix in n dimention
Replies: 2
Views: 530

Re: find rotation matrix in n dimention

are you asking about what they talk about here? https://en.wikipedia.org/wiki/Rotation_matrix#Geometry
:wave:
by little_dragon
Sat May 07, 2016 1:15 pm
Forum: Trigonometry
Topic: Trig Identity prob: show that cot^2x sinx/(1-sinx)(1+sinx) = 1/sinx
Replies: 1
Views: 194

Re: Trig Identity prob: show that cot^2x sinx/(1-sinx)(1+sinx) = 1/sinx

show that cot^2x sinx/(1-sinx)(1+sinx) = 1/sinx i'm taking your eqn to mean this: . . . . . \dfrac{\cot^2(x)\, \sin(x)}{(1\, -\, \sin(x))\, (1\, +\, \sin(x))}\, =\, \dfrac{1}{\sin(x)} use the way they show here: http://www.purplemath.com/modul...
by little_dragon
Sat May 07, 2016 1:01 pm
Forum: Geometry
Topic: Challenge: Finding the midline of an irregular shape
Replies: 1
Views: 292

Re: Challenge: Finding the midline of an irregular shape

your links lead to something that asks for payment or installation of software.
i'm not doing either.
sorry.
:wave:
by little_dragon
Wed Mar 30, 2016 5:11 pm
Forum: Calculus
Topic: Equation of a tangent line, did I do this wrong?
Replies: 1
Views: 281

Re: Equation of a tangent line, did I do this wrong?

(a) By using the definition of the derivative, find y' if y = 6 - 2x - x 2 . (b) Find the equation of the tangent line to the curve at the point (1, 3). (c) Find the point(s) at which the tangent line is horizontal. Here is... my work: (a) -2 - 2x how did...
by little_dragon
Wed Mar 30, 2016 5:05 pm
Forum: Beginning Algebra
Topic: Need help with this problem
Replies: 1
Views: 362

Re: Need help with this problem

The Amazon website plans to purchase ads in a local newspaper advertising their site. Their operating budget will allow them to spend at most $2200 on this advertising adventure. They plan to run at most 20 ads. An ad will cost $50 to appear in the weekday paper and $200 to appear in a weekend edit...
by little_dragon
Mon Jan 04, 2016 12:37 am
Forum: Calculus
Topic: One more question: line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8
Replies: 4
Views: 1094

Re: One more question: line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8

Wow this is really quick but I have one more question from the book. It's 18 under the AB Diagnostic Test: an equation to the line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8 is.... the answer is y+ pi/2 = 4x, and I'm struggling with how to get it what did you do after you did the deriv? plz show eve...

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