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veca=-5hati+hatj-3hatk,vecb=hati+2hatj-4...

`veca=-5hati+hatj-3hatk,vecb=hati+2hatj-4hatk` and `vecc=[(vecatimesvecb)timeshatj]timeshatj]timeshatj` then `vecc.(-hati+hatj+hatk)=`?

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JEE MAINS PREVIOUS YEAR-JEE MAIN 2024-Questions
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