Question

the mean deviation of a, a+d, ......a+2nd from mean

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In the adjoining figure l and m paralel and 'P' is the transversal intersecting them? angle A =angle E=65 degrees, then angle B=? then

The value of 2tan30degrres / 1+tan square 30degrees

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Find integral of 1/cos(x-a) cos(x-b)

If a matrices has 18 elements what are the possible order it can have ? what if it has 13 element? 

X(x+4)=12 Root of quadratic equation