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Find the sum of first n terms of the ser...

Find the sum of first n terms of the series:`1/(1+1^2+1^4)+2/(1+2^2+2^4)+3/(1+3^2+3^4)....`

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Find the sum to n terms of the series 1/(1 + 1^2 + 1^4) + 2/(1 + 2^2 + 2^4) + 3/(1 + 3^2 + 3^4) + ...

Finds the sum of first n terms of the series 3/(1^2xx2^2)+5/(2^2xx3^2)+7/(3^2xx4^2)+...... and hence deduce the sum of infinity.

Find the sum of first n terms of the series 3/1^2+5/(1^2+2^2)+7/(1^2+2^2+3^2) +.... .

Find the sum of first n terms of the following series : 1.2^(2) + 2.3^(2) + 3.4^(2)+…

Find the sum to n terms of each of the series in 1^2 + (1^2 + 2^2) + (1^2 + 2^2 + 3^2) + ...

Find the sum of n terms of the series 1+4/5+7/(5^2)+10/5^3+......

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UNITED BOOK HOUSE-JODHPUR PARK BOYS'S SCHOOL-EXERCISE
  1. If t1and t2 are the roots of the equation t^2+lambdat+1=0,where lambda...

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  2. Prove that Axx(BcupC)=(AxxB)cup(AxxC)

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  3. Find the distance from the eye at which a coin must be placed so as ju...

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  4. If cos(alpha+beta)=4/5.sin(alpha-beta)=5/13and alpha,betalie between 0...

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  5. Prove that cos((2pi)/7)+cos((4pi)/7)+cos((6pi)/7)=-1/2

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  6. Solve :6x^2-(5+3i)x+11i-3=0in the complex plane C.

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  7. Find the sum of first n terms of the series:1/(1+1^2+1^4)+2/(1+2^2+2^4...

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  8. Find n, if the ratio of the fifth term from beginning to the fifth ter...

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  9. Find the natural number a for which sum(k=1)^nf(a+k)=16(2^n-1)where th...

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  10. The line joing two points A(2,0)and B(3,1)I rotated about A in anti cl...

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  11. In what direction should a line be drawn through the pont (1,2) so tha...

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  12. If (alpha^2,alpha)lies inside the triangle bounded by the lines x-5y+6...

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  13. Find the equations of the circles which passes through the origin and ...

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  14. Show that :tan(142(1^@/2))=2+sqrt2-sqrt3-sqrt6

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  15. If A+B+C=pi,prove that :cosA+cosB-cosC=-1+4cosA/2cosB/2sinC/2.

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  16. Solve :(|x+3|+x)/(x+2)>1,x inR,

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  17. Find principal amplitude of (1+itan((3pi)/5))

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  18. A square is draw by joing the mid points of the sides of a given squar...

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  19. On the portion of the line x+3y-3=0 which is intercepted between the c...

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  20. Find the locus of the midpoint of the chords of the parabola y^2=4ax.w...

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