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If veca=2vecb and vecc=-3vecb, then what...

If `veca=2vecb` and `vecc=-3vecb`, then what is the angle between `veca` and `vecc` ?

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SHARAM PUBLICATION-MODEL QUESTION PAPER -15-EXERCISE
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  6. Find the area bounded by y=sinx,y=0,x=pi/2

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  11. If veca=2vecb and vecc=-3vecb, then what is the angle between veca and...

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