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If ` vec a\ a n d\ vec b` be two unit vectors and `theta` is the angle between them. Then ` vec a+ vec b\ ` is an unit vector, if `theta=` `pi/2` b. `(2pi)/3` c. `pi/4` d. `pi/3`

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RD SHARMA ENGLISH-SCALAR OR DOT PRODUCT-All Questions
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  19. If theta is an acute angle and the vector (sintheta) hat i+(costheta)...

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  20. If vec a\ a n d\ vec b be two unit vectors and theta is the angle be...

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