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Find the obtuse angle between the lines ...

Find the obtuse angle between the lines `x-2y+3=0\ a n d\ 3x+y-1=0.`

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Slope of 1st line is `1/2`
slope of 2nd line is `3`
so,
`tantheta=(1/2+3)/(1-1/2xx3)`
`tantheta=7`
`theta=tan^(-1)(7)`
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