p is a point in the plane of triangle ABC and L,M,N are the feet of the perpendiculars from P on to the sides of the triangle then prove that if the value of MN+NL+LM is constant and equal to l the least value of of PA^2+PB^2+PC^2 is l^2/sin ^2A+sin ^2B + sin ^2C

pls answer this anyone asap...it has been 3 days by now
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