Calculate the value of i.j

Dear Student,

\hat{i} . \hat{j} = \hat{i} \hat{j} C o s θ = \hat{i} \hat{j} C o s 90 ° = 0 θ = 90 ° a s \hat{i} a n d \hat{j} a r e m u t u a l l y p e r p e n d i c u l a r .

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