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Question : 34 of 160
Marks:
+1,
-0
Solution:
Consider the given data,
a×(b×c)=b+c (a.c)b−(a.b)c=b+c Let the angle between a and c be α and the angle between a and b be β then,
(cos‌α)b−(cos‌β)c=b+c From above,
cos‌α= α=30° And,
cos‌β=− β=120°
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