Givin complete course discription on trignometry in one or two class is
never possible to any one.
In right angle triangle ABC ,let one angle A is x and its complement B is 90-x and angle C is 90.
These are called trignometric ratios.
Also there are reciprocal to these ratios.
Cot^2A+1= Cosec^2 A
These are basics ,more detail you can ask questions.