Some tips given out to ease learning.

Topic 2.1 - Trigonometric Identities

Topic 2.2 - Addition and Subtraction Formulas

Topic 2.3 - Double-angle, Half-angle, And Product-sum Formulas

Topic 2.4 - Basic Trigonometric Equations

Topic 2.5 - Polar Coordinates

Topic 2.6 - Polar Form Of Complex Numbers; De Moivre’s Theorem