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## tan theta – cot theta/sin theta cos theta = tan^2 theta – cot^2 theta.

## If the roots of the equation (a-b)x^2 +(b-c)x+(c-a) =0 then prove that b+c=2a

## The area of a circle inscribed in an equilateral triangle is 154 sq. cm. Find the perimeter of the triangle.

## If (a,b) is mid point of line segment joining the points A(10,-6), B(k,4) and a-2b =16,then find the value of k and the distance AB.

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