Question:
If a line makes angles $a, \beta$ and $y$ with the $x$-axis, $y$-axis and $z$-axis respectively then $\left(\sin ^{2} a+\sin ^{2} \beta\right.$ $\left.+\sin ^{2} y\right)=?$
A. 1
B. 3
C. 2
D. $\frac{3}{2}$
Solution:
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