a) Definitions - Right Triangle Definition and Unit Triangle definition
b) Facts and properties of trigonometric functions i.e., Domain, Range and period
c) Formulas and Identities (includes Tangent and Cotangent Identities, Reciprocal Identities, Pythagorean Identities, Even/Odd Formulas, Periodic formulas, Double Angle formulas, Degree to radian formulas, Half-angle formulas, Sum and Difference formulas, Product to sum formulas, Sum to product formulas, and Co Function Formulas)
d) Unit circle explained
e) Inverse Trigonometric functions and its properties
f) Law of sines, Cosines and tangents which are define the relationship between the angles of a triangle and its sides.
I wish this app to be use-centric. So, I would like to request you to try this app and make any suggestions to improve it further. I will be happy to provide updates based on your inputs.