Sum and Difference Identities
30 tutor-authored questions for this Ontario curriculum expectation, ordered easiest to hardest, every one with a full worked solution. Work through all 30 with your weekly-lesson access code.
Sample: the first question, solved
Which identity correctly expands sin(A+B)?
📘 Worked solution
✓The sine sum identity combines both angles' sine and cosine ratios: sin(A+B)=sin(A)cos(B)+cos(A)sin(B).
And one from the hard end
"Find the exact value of tan(15°), using the difference identity with A=45°, B=30°."
Solution shown after you try it in practice mode.
Work through all 30, easiest to hardest
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