I Forgot The Formula - No Worry
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Formula and Calculator as a Service
by Apolinario (Sam) Ortega
INVBAT.COM is helping students, teachers, and employees to remember, create, manage, and host their customize combine formula and calculator website for only $2 per month for technical support and website management fee. Imagine even student can afford to hire a software engineer, network engineer, website designer paying them only $2.00 per month. How is this possible ? because of the economy of scale and advertising income from company sponsorship.
Click the subscribe button for free 30 days trial. After your subscription please contact us at admin@invbat.com to help you create your customize combine formula and calculator website.
We are using Amazon Web Services such as EC2-Linux, EBS and S3 cloud technology and Yahoo web hosting in order to serve our growing number of public users.
Related topic: So what If I forget my formula and calculator? Why do I need to care?
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Proving Trigonometric Identities by Graphical Method
y = Sin (2x ) is identical to
y = 2Sin(x)Cos(x)
By using graphical method of proving trigonometric identities, it is easy to see that the two functions are identical therefore it proves that
Sin (2x) = 2Sin(x)Cos(x)
You can use Google search to graph the two functions. Enter in Google search as is:
sin(2x),2sin(x)cos(x) then press enter in your keyboard.
Or you can use Geogebra shown below.
INSTRUCTION ON HOW TO USE GEOGEBRA:
Step 1: Delete text1 by selecting it and then selecting ⊠
Step 2: Delete conic equation labeled "c" and "d" and then selecting ⊠
Step 3: Enter in input as is: f(x)=sin(2x) then press enter button in your keyboard
Step 4: Enter in input as is: g(x)=2sin(x)cos(x) press enter button in your keyboard
Step 5: Click function f(x) and next click function g(x), you will notice that only their colors changes.
You will notice that the two graphs are identical therefore it proves that the two trigonometric function are identical meaning you can use either one of the functions and the answer will be identical.
Apolinario "Sam" Ortega, 19 January 2013, Created with Geogebra
