P2.6 - Trigonometry

Knowledge and use of sinθ tan θ =, cosθ and sin2 θ + cos2 θ = 1.

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

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

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

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

Solve simple trigonometric equations in specified degree or radian intervals, including equations requiring identities, transformations or reduction to a quadratic form.

Use solving trigonometric equations to connect the rule to the data and decision in the question.

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

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

Boundary: use the formula and units given in the question, show the substitution and interpret the result; the calculation alone is not the conclusion.