P3.2.2 - Further trigonometric identities

Knowledge and use of sec2 θ = 1 + tan2 θ and cosec2 θ = 1 + cot2 θ.

Use further trigonometric identities to connect the rule to the data and decision in the question.

This matters because further trigonometric identities determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply further trigonometric identities to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Further trigonometric identities is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.