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Let `veca=3hati-hatj, vecb=hati-2hatj, vec c=-hati+7hatj` and `vecp=veca+vec
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Let `veca=3hati-hatj, vecb=hati-2hatj, vec c=-hati+7hatj` and `vecp=veca+vecb+vec c`. Then `vecP` in terms of `veca` and `vecb` is
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