Answer Key — Identities and equations
Trigonometry
Do not share with students before practice tests.
Worksheets — Sets 1–10
| Set | Guidance | | --- | --- | | Set 1 | Identities and equations — verify written work and accept reasonable drawings. | | Set 2 | Identities and equations — verify written work and accept reasonable drawings. | | Set 3 | Identities and equations — verify written work and accept reasonable drawings. | | Set 4 | Identities and equations — verify written work and accept reasonable drawings. | | Set 5 | Identities and equations — verify written work and accept reasonable drawings. | | Set 6 | Identities and equations — verify written work and accept reasonable drawings. | | Set 7 | Identities and equations — verify written work and accept reasonable drawings. | | Set 8 | Identities and equations — verify written work and accept reasonable drawings. | | Set 9 | Identities and equations — verify written work and accept reasonable drawings. | | Set 10 | Identities and equations — verify written work and accept reasonable drawings. |
Worksheets — Sets 11–20
| Set | Guidance | | --- | --- | | Set 11 | Identities and equations — verify written work and accept reasonable drawings. | | Set 12 | Identities and equations — verify written work and accept reasonable drawings. | | Set 13 | Identities and equations — verify written work and accept reasonable drawings. | | Set 14 | Identities and equations — verify written work and accept reasonable drawings. | | Set 15 | Identities and equations — verify written work and accept reasonable drawings. | | Set 16 | Identities and equations — verify written work and accept reasonable drawings. | | Set 17 | Identities and equations — verify written work and accept reasonable drawings. | | Set 18 | Identities and equations — verify written work and accept reasonable drawings. | | Set 19 | Identities and equations — verify written work and accept reasonable drawings. | | Set 20 | Identities and equations — verify written work and accept reasonable drawings. |
Review tiers 1–10
- Checklists are parent-judged.
- Written items: verify against practice set patterns.
- Standard text: Pythagorean, reciprocal, and quotient identities Sum, difference, double-angle, and half-angle formulas Product-to-sum and sum-to-product identities (optional) Solving basic trigonometric equations Inverse trigonometric functions: domains and ranges
Practice test scoring
| Tier | Pass guidance | | --- | --- | | 1–3 | Most oral tasks smooth; majority of written correct | | 4–6 | 7/10+ total with clear understanding | | 7–8 | 9/12+ with explanations | | 9–10 | Near-perfect; ready to move on |
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