Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

Let x = r cos (t), y = r sin (t) cos (u), z = r sin (t)sin (u). Then the value of x2 + y2 + z2 is ___.

1
\(r^2 \cos(u)\)
2
r2
3
2r
4
r2 sin (t)

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