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Find the angle between the planes vec(...

Find the angle between the planes
`vec(r).(2vec(i)-vec(j)+2vec(k))=3` an `vec(r).(3vec(i)+6vec(j)+vec(k))=4`.

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The correct Answer is:
`therefor theta="cos"^(-1)(2)/(3sqrt(46))`.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-PRODUCT OF VECTORS-SOLVED PROBLEMS
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  2. If veca=6veci+2vecj+3veck and vecb=2veci-9vecj+6veck then find veca.ve...

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  3. If bar(a)=bar(i)+2bar(j)-3bar(k)and bar(b)=3bar(i)-bar(j)+2bar(k) , th...

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  4. IF | veca + vecb|=| veca - vecb| , then what is the angle betwe...

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  5. If |veca|=11,|vecb|=23 and |veca-vecb|=30, then find the angle between...

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  6. If veca=veci-vecj-veck and vecb=2veci-3vecj+veck, then find the projec...

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  7. If P, Q, R and S are points whose position vectors are bari-bark, -bar...

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  8. If vectors lambda bar(i) - 3bar(j)+5bar(k), 2lambda bar(i) - lambdabar...

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  9. Let veca=2veci+3vecj+veck,vecb=4veci+vecj and vec(c)=veci-3vecj-7veck....

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  10. Show that the vectors 2hati-hatj+hatk,hati-3hatj-5hatkand3hati-4hatk f...

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  11. P.T the smaller angle theta between any two diagonals of a cube is giv...

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  12. Let bara,barb,barc be non-zero mutually orthogonal vectors. If xbara+y...

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  13. Let bara, barb and barc be mutually orthogonal vectors of equal magnit...

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  14. The vectors bar(AB) = 3bari - 2barj + 2bark and bar(BC) = -bari - 2bar...

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  15. Find the Cartesian equation of the plane passing through the point (-2...

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  16. Find the cartesian equation of the plane through the point A (2,-1,-4)...

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  19. If veca=2veci-3vecj+5veck,vecb=-veci+4vecj+2veck, then find vecaxxvecb...

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  20. If bar(a)=2bar(i)-3bar(j)+5bar(k),bar(b)=-bar(i)+4bar(j)+2bar(k), then...

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  21. Find the area of the parallelogram for which the vectors veca=2veci-3v...

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