Every trigonometry problem is based on the formulas.
They r many indenties like:
Sin^2a + cos^2a=1
Sec^2a - tan^2a= 1
Cosec^2a - cot^2a = 1.
The best way to solve trigonometry problems.. Is to convert the terms like cosecant , secant , cot into sine , cosine , tangent respectively.
It's the better way to solve the problems.
And it is east to verify the value , if the problem is given in such a way that , to prove L.H.S=R.H.S.
Every formula shud be know by us. And we have to ensure that.
We have to know the angles made my the trigonometry ratios.