- Fri Aug 19, 2016 7:07 pm
- Forum: Trigonometry
- Topic: Given that ×=tan theta find arcot x in terms of theta
- Replies:
**1** - Views:
**275**

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 ...

- Thu Jul 28, 2016 3:48 pm
- Forum: Uncategorized
- Topic: Where to start?
- Replies:
**1** - Views:
**417**

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...

- Mon May 30, 2016 2:18 pm
- Forum: Intermediate Algebra
- Topic: Graphing calculator resources?
- Replies:
**1** - Views:
**424**

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...

- Fri May 20, 2016 5:27 pm
- Forum: Intermediate Algebra
- Topic: Work problem
- Replies:
**1** - Views:
**347**

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...

- Sat May 07, 2016 1:20 pm
- Forum: Matrix (Linear) Algebra
- Topic: find rotation matrix in n dimention
- Replies:
**2** - Views:
**701**

are you asking about what they talk about here? https://en.wikipedia.org/wiki/Rotation_matrix#Geometry

- 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:
**261**

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...

- Sat May 07, 2016 1:01 pm
- Forum: Geometry
- Topic: Challenge: Finding the midline of an irregular shape
- Replies:
**1** - Views:
**373**

your links lead to something that asks for payment or installation of software.

i'm not doing either.

sorry.

i'm not doing either.

sorry.

- Wed Mar 30, 2016 5:11 pm
- Forum: Calculus
- Topic: Equation of a tangent line, did I do this wrong?
- Replies:
**1** - Views:
**343**

(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...

- Wed Mar 30, 2016 5:05 pm
- Forum: Beginning Algebra
- Topic: Need help with this problem
- Replies:
**1** - Views:
**434**

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...

- 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:
**1174**

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...