In trignometry , only you need to remember three ratios and one universal identity.
Let ABC is triangle ,right angle at B. There are two angles left now namely angle A and angle C. You can now apply angle sum propert of triangle,
You will find angle A and C are complementry angles.
In right angle ,hypotenuse remain same while base and perpendicular change
For angle A , base =AB ,perpendicular=BC
For angle C , base=BC and perpendicular=AB
These are three fundamentals of trignometry . remember it and proper manipulation can solve any problem of your standard.
Thank you very much that has helped alot!