Subject: Maths, asked on 28/12/12

## cotx cot2x - cot2x cot3x-cot3x cotx=1

Subject: Maths, asked on 18/12/11

## What is assumed mean &how can we find it

Subject: Maths, asked on 29/10/12

## Prove that 1.2 + 2.3 + 3.4 +..............n(n+1) = 1/3 n (n+1)(n+2)

Subject: Maths, asked on 2/8/13

## sinx+sin2x+sin3x+...+sin nx=sin((n+1)/2)x .((sin nx)/2) / sin(x/2)

Subject: Maths, asked on 6/12/11

## In how many ways can a lawn tennis mixed double be made up from seven married couples if no husband and wife play in the same set?

Subject: Maths, asked on 2/5/13

## cos2x + cos2(x + pi/3) + cos2(x - pi/3) = 3/2. prove

Subject: Maths, asked on 26/2/13

## prove that cos20 cos 40 cos 60 cos 80=1/16.

Subject: Maths, asked on 31/8/15

## the second, third and fourth term of the binomial expansion (x+a)n  (n is actually (x+a)raised to the power n) are 240, 720 and 1080. find x, a and n.

Subject: Maths, asked on 26/11/10

## Find the term independent of x in the expansion of (2x - 1/x)10

Subject: Maths, asked on 18/7/13

## prove that (A-B) U (B-A) =(A U B) - (A intersection B)

Subject: Maths, asked on 23/7/12

## prove thatcosA +cosB +cosC +cos(A+B+C) = 4cos((A+B) / 2)cos((B+C) / 2)cos((C+A) / 2)

Subject: Maths, asked on 4/3/12

## derivative using first principle -sin_/x (sin under root x)

Subject: Maths, asked on 23/10/12

## Differentiate sinx/x from the first principle.

Subject: Maths, asked on 26/8/12

## sin4x+cos4x=1-2sin2xcos2x

Subject: Maths, asked on 11/7/15

## derivative of 1)logx by first principle

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