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Let vec a , vec b a n d vec c be three ...

Let ` vec a , vec b a n d vec c` be three vectors having magnitudes 1, 5and 3, respectively, such that the angel between ` vec aa n d vec bi stheta` and ` vec axx( vec axx vec b)=c` . Then `t a ntheta` is equal to a. 0 b. 2/3 c. 3/5 d. 3/4

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