Double Angle 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 expresses sin(2θ)?
📘 Worked solution
✓The double angle identity for sine comes from the sum identity with A=B=θ: sin(2θ)=2sin(θ)cos(θ).
And one from the hard end
"If sin(θ)=5/13, θ in Quadrant II, find sin(2θ) and cos(2θ)."
Solution shown after you try it in practice mode.
Work through all 30, easiest to hardest
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