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by little_dragon
Fri Nov 25, 2016 7:40 pm
Forum: Trigonometry
Topic: Need help verifying an identity - sums and differences
Replies: 2
Views: 150

Re: Need help verifying an identity - sums and differences

Can anyone help me verify this identity? tan (a-b) = (1 - cot(a) tan(b)) / cot(a) + cot(b) they show how to do this stuff here: http://www.purplemath.com/modules/proving.htm the right hand side (RHS) is messier so try starting there see if maybe the fraction simplifies 1 - cot(a)tan(b) = 1 - cot(a)...
by little_dragon
Wed Oct 12, 2016 2:50 pm
Forum: Beginning Algebra
Topic: floor tiles: 12" by 12"; how many needed for 12ft by 31ft floor?
Replies: 6
Views: 219

Re: floor tiles: 12" by 12"; how many needed for 12ft by 31ft floor?

How many tiles will I need when covering a floor which measures 12ft by 31ft. The tiles are 12 inches by 12 inches. there are 12" in 1' so the tiles are 1' by 1' or 1' square. my steps so far: 12 x 31 = 372 now since the tiles are in inches I need to convert that 372 feet into inches. so 372 x...
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: 456

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: 710

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: 540

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: 499

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: 892

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: 351

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: 499

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: 473

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...

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