Please Answer this.

Dear Student,

Please find below the solution to the asked query:

Here, the magnitude of the unit vectors is 1 unit. So, according to the law of vector addition (subtraction), 

i^-j^=i^2+j^2-2i^j^ cos 900i^-j^=12+12-2×1×1×0i^-j^=2 units


Hope this information will clear your doubts about the topic.

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