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Question : 132 of 160
Marks:
+1,
-0
Solution:
Given that,
l1=‌,m1=‌ and
n1=‌and
l2=‌,m2=‌‌‌ and
n2=‌∴cos‌θ‌=|l1l2+m1m2+n1n2|‌=|‌×‌+‌×‌+‌×(‌)|‌=|‌+‌−‌|=|−‌|=‌⇒‌‌θ‌=‌
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