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1.28 Let P 2a, 4a, + a, and Q a +2a, Find R which has magnitude 4 and is perpen- dicular to both P and Q. / 1.29 Let G-xa-ya, + 2za, and H :-уга, + 3a,-xza.. At point (1,-2, 3), (a) calculate the magnitude of G and H, (b) determine G.H, (c) find the angle between G and H. 1.30 A vector field is given by H 10уга,-8xyza, + 1raz

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502 A 1.24 C-213) KnI= 6.403 | Aus of H4.69 Angle bl w G1 and 니 4I 22 6-a叻(-0,466)

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