Quickly derive the identities. No need to memorize.
result for sine
result for cos
result for tan
and multiply numerators and denominators of them
result for cot
and multiply numerator and denominator
More results of Trigonometric values for compound Angles
It is advised to do the firmfunda version of "basics of Trigonometry" course before doing this.
The outline of material to learn "Advanced Trigonometry" is as follows.
Note: go to detailed outline of Advanced Trigonometry
→ Unit Circle form of Trigonmetric Values
→ Trigonometric Values in all Quadrants
→ Trigonometric Values or any Angles : First Principles
→ Understanding Trigonometric Values in First Quadrant
→ Trigonometric Values in First Quadrant
→ Trigonometric Values of Compound Angles: Geometrical Proof
→ Trigonometric Values of Compound Angles: Algebraic Proof
→ Trigonometric Values of Compound Angles: tan cot
→ Trigonometric Values of Compound Angles: more results