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veca+vecb+vecc=vec0, |veca|=3, |vecb|=5,...

`veca+vecb+vecc=vec0, |veca|=3, |vecb|=5,|vecc|=9`,find the angle between `veca` and `vecc`.

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If veca+vecb+vecc=0,|veca|=3,|vecb|=5,|vecc|=7 find the angle between veca and vecb

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