Question

8. 0A, OB, OC are mutually perpendicular lines through the origin and their
direction cosines are l1, m1, n1 ; l2, m2, n2; I3, m3, n3., If OA=a,
OB = b, OC =c; prove that the equation of the sphere OABC is :
x2 + y2 +z2 – x(al1 + bl2 +cl3)- y(am1 +bm2 +cm3)
-z(an1 + bn2 + cn3) = 0

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Answer 1

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