Identity Index in Trigonometry
Here is the formula index in trigonometric identities. Again, identities are the fundamentals of trigonometry. This is the counterpart of four basic operations in arithmetic.
Addition and Subtraction Identify
Special Reduction Identity
Double Angle Identity
Half Angle Identity
Product to Sum Identity
Sum to Product Identity
If you want to add more, feel free to add in comment box and I’m glad to include that.