If bar(a)=2hat i+2hat j+hat kand bar(b)=...

If `bar(a)=2hat i+2hat j+hat k`and `bar(b)=hat i-hat j-chat k`.If angle between `bar(a) and bar(b)` is `37^(0)`.The value of c is (take,`cos37^(0)=(4)/(5)`

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