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Question : 95 of 120
Marks:
+1,
-0
Solution:
Let,
=−+ and
=++ cos‌θ= .=(−+) .(++) =−+1 =1 And,
||=√()2+(−)2+(1)2 =√++1 =√2 ||=√()2+()2+(1)2 =√++1 =√2 ∴cos‌θ== ⇒θ=60° Hence, option (1) is correct.
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