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Question : 89 of 120
Marks:
+1,
-0
Solution:
Given,
||=16,||=4 Let
and
be any two vectors and θ be the angle between them, then
.=ab‌cos‌θ ×=ab‌sin‌θ., where
n is unit vector
Consider,
√|×|2+|.|2 √|‌sin‌θ|2+|‌cos‌θ|2 =√||2||2(sin2θ+cos2θ) =√||2||2 =|||| =(16)(4) =64
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