*Inverse function
Function of the form, 
have the shown variation. All the curves pass through the point (1, 1). For n > 1 the graph lies above the rectangular hyperbola
(n =1) in the region
0 < x < 1 and then lies below it in the region x > 1. For 0 < n < 1 the graph first lies below the hyperbola in the region 0 < x < 1 and then lies above the hyperbola in the region x > 1.
*Point slope form
Equation of a straight line having slope m and passing through a point A (x1, y1) is 
2 point form
Equation of a straight line passing through two point A (x1, y1) and B (x2, y2) is 
*Determinants of 3rd order
*Property of supplementary angles.
If α + β = 1800, then:
sinα= sinβ,cosα = -cosβ & tanα= – tanβ
>Trigonometric series
^A long horizontal fixed wire carries a current of 100 A. Directly above and parallel to it is another wire carrying a current of 20 A and weighing 0.04 N/m. The separation between the two wires so that the upper wire is just supported by the magnetic repulsion is
Call 9872662552