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If the planes Find the angle between the planes ` vec rdot(2 hat i- hat j+lambda hat k)=5a n d vec rdot(3 hat i+2 hat j+2 hat k)=4.` are perpendicular. Find the value of `lambdadot`

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Given,
` vec rdot(2 hat i- hat j+lambda hat k)=5 and vec rdot(3 hat i+2 hat j+2 hat k)=4.`
are perpendicular so,
`n1=2 hat i- hat j+lambda hat k`
and `n2=3 hat i+2 hat j+2 hat k`
So,
`n1.n2=0`
`(2 hat i- hat j+lambda hat k )(3 hat i+2 hat j+2 hat k)=0`
`=>6-2+2lambda=0`
`=>lambda=-2`
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