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Comprehension:(Que No. 85 - 88) ++= such that
||=3,||=5 and
||=7
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Question : 87 of 120
Marks:
+1,
-0
Solution:
Here,
||=3,||=5 and
||=7 ++=⇒+=− |+|2=||2+||2 +2||.||cos‌θ ⇒|−|2=||2+||2 +2||.||cos‌θ ⇒32=52+72+2(5)(7)‌cos‌θ ⇒9−25−49=70‌cos‌θ ⇒cos‌θ=(−65∕70)=(−13∕14) Hence, option (4) is correct.
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