If `veca and vecb` are two vectors, such that `veca.vecblt0 and |veca.vecb|=|vecaxxvecb|` then the angle between angles between the vectors `veca and vecb` isA. `pi`B. `7pi//4`C. `pi//4`D. `3pi//4`

If `veca and vecb` are two vectors, such that `veca.vecblt0 and |veca.

1.	If `veca and vecb` are two vectors, such that `veca.vecblt0 and \|veca.vecb\|=\|vecaxxvecb\|` then the angle between angles between the vectors `veca and vecb` isA. `pi`B. `7pi//4`C. `pi//4`D. `3pi//4`
Answer» Correct Answer - d `\|veca.vecb\|=\|vecaxxvecb\|` `Rightarrow\|veca\|\|vecb\|\|costheta\|=\|veca\|\|vecb\|\|sin theta\|` (where,`theta` is the angle between `veca and vecb`) `Rightarrow \|costheta\|= \|sintheta\|` `Rightarrow theta= pi/4 or (3pi)/4(as 0 le thetalepi)` But `veca.vecb lt 0`, therefore, `theta= (3pi)/4`

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If `veca and vecb` are two vectors, such that `veca.vecblt0 and |veca.vecb|=|vecaxxvecb|` then the angle between angles between the vectors `veca and vecb` isA. `pi`B. `7pi//4`C. `pi//4`D. `3pi//4`

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