Trigonometrymedium · Past Paper
What is the simplified form of cos⁴ θ - sin⁴ θ?
A1
Bcos 2θ
Csin 2θ
Dcos² θ
✓ Correct Answer: B — cos 2θ
Factorizes to (cos² θ - sin² θ)(cos² θ + sin² θ) = cos 2θ * 1 = cos 2θ.
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