How to Approach a Trigonometric Questions

Trigonometric Functions (CAST)

Graphs of Trigonometric Functions

General Solutions to Trigonometric Functions

All Solutions to Trigonometric Functions (Part 1)

All Solutions to Trigonometric Functions (Part 2)

General and All Solutions to Trigonometric Functions (Part 3)

Trigonometric Identities

Compound angles

Double Angles

Changing Products to Sums and Differences

**Derivation of Formula 1 and 2. (Cos squared A + Sin squared A = 1) and (Sine Rule)**

**Derivation of Formula 3. The Cosine Rule**

Deviation of Formula 4: Cos (A-B)=CosAcosB + SineASineB

Deviation of Formula 5: Cos (A+B) = Cos ACosB-SinASinB

Deviation of Formula 6: Cos2A=Cos squred A - Sin Squared A

Deviation of Formula 7: Sin(A+B)=SinAcosB + CosAsinB

Deviation of Formula 8: Tan (A+B)=Sin(A+B)/Cos(A+B)

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