Trigonometry and identities in N(A)-Level Additional Mathematics (4051): the sine, cosine and tangent ratios on the unit circle and their signs by quadrant, the quotient and Pythagorean identities, and solving trigonometric equations within a stated range

An N(A)-Level Additional Mathematics (4051) overview of trigonometry and identities in the Geometry and Trigonometry strand. The unit-circle definitions of sine, cosine and tangent and their signs in each quadrant, the quotient and Pythagorean identities, and how to solve trigonometric equations within a stated range using the basic angle, with links to every dot point.