Trigonometryhard · Past Paper
If x = r cos T sin P, y = r cos T cos P, z = r sin T, then x^2 + y^2 + z^2 = ?
Ar
Br^2
C1
D0
✓ Correct Answer: B — r^2
This is the transformation to spherical coordinates; sin^2 + cos^2 identities reduce it to r^2.
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