1.

Find the angle between veca and vecb if |vecaxxvecb| = veca.vecb

Answer»

Solution :`|vecaxxvecb|` = `veca.vecb`
`implies |veca||vecb|SINTHETA` = `|veca||vecb|cos THETA`
`implies sintheta` = `COSTHETA`
`implies theta` = `pi/4`
THEREFORE Angle between `veca` and `vecb` = `theta` = `pi/4`


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