Romel Verterra's blog

Wazzup at July 2015

For this year, we already serve about 5.5 million page views from about 800 thousand unique visitors, 40.2% of which are returning visitors spending an average of 6 minutes per visit. Thank you for the time you spent to us, your repeat visits showed that you made us a part of your growth in our subjects. We are about to reach 25 thousand likes in our FB page. We owe all of these from your trust to our contents and we are deeply grateful to that. Despite of no marketing arm and no single cent spent to promote the site, we reach this milestone all because of your trust to us. Thank you very much.

Polar Coordinate Printable Paper (Free Download)

This is just a quick post and I hope you find this useful.



One time, I browse for something at the Morayta branch of National Book Store and I heard a group of students asking to the sales lady if they have a polar graph paper. From the look of her face, the sales lady seemed know nothing about a polar paper and she courteously told the students that they don't have what they are looking. is now offering tutorials for Engineering Mathematics

Since the founding of in Nov. 2007, it never came into my mind to get this name into some offline activity like tutorial. I experimented on this site many free services like forums, online quiz, online tutorials, etc. but never been to offline. For the past two years however, I've been invited several times to conduct review classes to graduating engineering students of Eastern Visayas State University (EVSU). And as early as now, Prof. Nida Catubao from the Chemical Engineering Department of EVSU, verbally (informally) invited me to give math lecture to their graduating chemical engineering students by next school semester.

This site has been doing some amazing things on my chosen profession as review instructor. Although many of the invitations that I received are coined to where I am currently connected, which is the Gillesania Engineering Review and Training Center (GERTC), the fact is so obvious that students recognize me as the author of On that, I am very much thankful and amazed on how this site leveled me up into some degree. I am also thankful on how the market respond to the Strength of Materials I printed last year which is truly rewarding.

Calculator Technique for Solving Volume Flow Rate Problems in Calculus

The following models of CASIO calculator may work with this method: fx-570ES, fx-570ES Plus, fx-115ES, fx-115ES Plus, fx-991ES, and fx-991ES Plus.

The following calculator keys will be used for the solution

Name Key Operation
Shift shift.jpg SHIFT
Mode mode-setup.jpg MODE
Name Key Operation
Stat 1-stat.jpg SHIFT → 1[STAT]
AC ac-off.jpg AC


This is one of the series of post in calculator techniques in solving problems. You maybe interested also on my previous post in calculator technique for progression problems and calculator technique for clock problems; both in Algebra.

Calculator Technique for Clock Problems in Algebra

The following models of CASIO calculator may work with these methods: fx-570ES, fx-570ES Plus, fx-115ES, fx-115ES Plus, fx-991ES, and fx-991ES Plus.

Before we go to Calculator technique, let us first understand the movements of the hands of our continuously driven clock.

For simplicity, let "dial" be the unit of one hand movement and there are 60 dials in the complete circle as shown in the figure.

Calculator Techniques for Solving Progression Problems

This is the first round for series of posts about optimizing the use of calculator in solving math problems. The calculator techniques I am presenting here has been known to many students who are about to take the engineering board exam. Using it will save you plenty of time and use that time in analyzing more complex problems. The following models of CASIO calculator may work with these methods: fx-570ES, fx-570ES Plus, fx-115ES, fx-115ES Plus, fx-991ES, and fx-991ES Plus.

Calculator for Engineering Board Exam

Any one who took an engineering board examination will agree with me that scientific calculator is our best friend during the examination. It will speed up our work and will allow us to go through the analysis of the problem. In most cases, solving the equation is not the real issue, it is to write the correct equation that matters. If we are able to determine the correct equation of a particular situation, the burden of that problem is over. Our next step is obviously to solve for the desired value. It is important to note that the correct answer can only be derived from the correct equation. To determine the correct equation is where should our brain go, not in finding the solution of that equation. You guess it right, we use our best friend, the scientific calculator, to do the task. Don't do manual calculation please, the examiner will not give you bonus points in finding the roots of

$9\sin^{3/4} \theta + 4\sin^{3/2} \theta - 12 = 0$


manually. Calculator can easily solve for the value of θ fast and accurate than you.

How to Backup and Restore MySQL Database from Linux Command Line

I wrote this post so that I can easily retrieve information that I pulled from several pages from the internet. I have this need to migrate some large MySQL database to another server and I need to do it from the command line of Linux. To make this information at least a little complete, below is the outline of my situation and what I need to do.

  • The OS of origin and destination servers are both CentOS 5
  • The control panel of the origin is cPanel and the destination is a custom made control panel
  • Databases are MySQL
  • Most websites are Drupal and some are WordPress
  • My machine where I am accessing my server is Windows
  • The SSH client I am using is PuTTy, it's free
  • I'm a Windows guy making mess in Linux. :)

How to Import large MySQL database to phpMyAdmin

Unable to import that large MySQL database into phpMyAdmin? There are reasons why you simply can't import your large MySQL database; browser timeout, server timeout, file size limit, and phpMyAdmin limit are the most common. These are real pains that cannot be avoided specially in shared web hosting. But stop pulling hairs, there are many proven ways to import your large database. In this discussion, I will only share two ways in which I have a first hand experience.