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Find angle between vecA = 3 hati +...

Find angle between ` vecA = 3 hati + 4 hatj and vecB = 12 hati + 5 ?`

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we have cos` theta = ( vecA . vecB)/(AB ) = (( 3 hati + 4 hatj ).( 12 hati + 5 hatj))/( sqrt(3 ^2 + 4^2 ) sqrt( 12^2 + 5^2))`
` cos theta = ( 36 +20 )/( 5 xx 13 ) = (56 )/( 65 ) , theta = cos ^(-1) ( 56 )/( 65 )`
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