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Find the general solution for
Solution:
Consider the given equation above
Did you notice that the given equation cannot be solved by separation of variables? A trigonometric function is a combination of x and y in the function and there's no way that we can separate x and y.
This type of differential equation is a homogeneous function. Let's consider this procedure in solving the given equation as follows
Let
so that
Substitute the values of y and dy to the given equation, we have
The resulting equation can now be separated by separation of variables as follows
Integrate on both sides of the equation, we have
Take the inverse natural logarithm on both sides of the equation, we have
But
Hence, the above equation becomes
Therefore, the general solution is
