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If |a|=10, |b|=2 and a.b=12, then value of |a xx b| is |
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Answer» 5 `:' a.b =|a||b| cos THETA` `implies 12=10xx2.cos theta` `implies cos theta=3/5` `:' axxb=|a||b| sin theta.HAT(N)` `implies |axxb|=|a||b||sin theta|.|hat(n)|""[ :' |hat(n)|=1]` `implies |axxb|=10.2.|sqrt(1-cos^(2) theta)|.1` `=20.|sqrt(1-9//25)|` `=20xxsqrt(|16/25|)=20xx4/5` `implies |axxb|=16` |
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