Trigonometry equation

Working on trigonometric equations were so difficult for me, do you know the reason.? It was because i didn't know what is the definition of trigonometry, therefore i thought i will discuss on the definition of trigonometry equations here.

Definition of a trigonometry equation:-

An equation which is involved in a trigonometrical function is called a trigonometrical equation. Trigonometry equations can have infinite number of solutions. The solution of this equation is the value of the unknown angle that satisfies the equation.

Lets work on negative correlation, give me your comments on this.