Q. If x=aCosθCosΦ, y = aCosθSinΦ and z= aSinθ, then the value of x2+ y2 + z2 is
A) 0
B) 2a2
C) a2
D) 4a2
✔ Correct Answer: a2
Exam Insight
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A) 0
B) 2a2
C) a2
D) 4a2
✔ Correct Answer: a2
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