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Let vec a(x)=(s in x) hat i+(cosx) hat ...

Let ` vec a(x)=(s in x) hat i+(cosx) hat j a n d vec b(x)=(cos2x) hat i+(sin2x hat j)` be two variable vectors `(x in R)dot` Then ` vec a(x)a n d vec b(x)` are a. collinear for unique value of `x` b. perpendicular for infinite values of `x` c. zero vectors for unique value of `x` d. none of these

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