TEST 12_ENGLISH 2_MATHEMATIC NR ‘07

I know.... Being a teacher is Not Easy

On Tuesday, 30 December 2008 as English lecturer teachers are attending the inauguration of the Yogyakarta State University, studying the English replaced day Wednesday. When I was working on a task to take advantage of the English language with a friend named Titin M. I explain to my friends on the Variation of Parameters in the building FMIPA. At 11:15 am, I start explaining about the lessons of differential equation.

Before I recount events funny when I explain about the Variation of Parameters to my friends, I will defining to you, what the Variation of Parameters? We as students of mathematics certainly not foreign to the lessons are. In my opinion, Variation of Parameters is a method to complete differential equation a constant coefficient and variable coefficients which complementary known function. Then we replace any constant c₁ and c₂ on the complementary function (y_c) with the v₁ and v₂ (y_p) so, the solution is a general equation y = y_c + y_p. Differential settlement with the method of variation of the parameters, we need to know the steps. The steps to complete the differential with a variation of parameters, among others: first we write the no homogenous differential equation, both of us to write a corresponding homogeneous equation, is derived from the equation complementary function, and any constant c₁ and c₂ (y_c) from the complementary we replace with v₁ and v₂ (y_p). Y_p function of our lower, further we get a system with variable v'₁ equality and v'₂. Now we find v'₁ and v'₂ with determinant’s coefficient-coefficient equation system it. Once we get v'₁ and v'₂, we seek v₁ and v₂ with integral v'₁ and v'₂. And the last step we substituting v₁ and v₂ on y_p, so we have the general solution of the differential equation.

We do not see a faint first step of a settlement before we try differential. So, yesterday I try to explain the variation of parameters to my friends. Do you want to know the story of my time explaining the variations of parameters to my friends? And this story...

Before the variation of parameters to her, I have to know that my friend was already understood about the lesson before the variation of parameters. Titin already understand the lesson before, so I started explaining the form of differential equation to be completed with the method of variation of parameter. Next, I explain the steps to get a general solution of the equation differential. After I finished the variation of parameters to my friends, whether he understands that it is? Titin equality can do to step down differential y_p function, and then he began to upset the value v'₁ and v'₂. I have to repeat the explanation for the value v'₁ and v'₂. Because it is still not understand, I explained that with the Indonesian language. Successful! She can find value v'₁ and v'₂, now he must integral value v'₁ and v'₂ to get value v₁ and v₂. Usually v'₁ value and the load v'₂ trig functions, so that he has difficulty integral functions. I told him to remember the lessons back integral calculus, so I help him to get value v₁ and v₂. The last step he can finish their own, then I give a problem to him to know what he is familiar or not. With these steps, he can do the problems easily. So, I can conclude that explain things to other people is not easy. We need patience so that we can be successful destination. I know ... being a teacher is not easy, but if we have any intention, we can do so easily.