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Solution :

`m_(1)=(1)/(2)` and `m_(2)=3` <br> Let the angle between two lines be `theta`. <br> `:.tan theta=|(m_(2)-m_(1))/(1+m_(1)m_(2))|` <br> `=|(3-(1)/(2))/(1+(1)/(2)*3)|=1` <br> `=tan45^(@)` <br> `implies theta=45^(@)`