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Applied Mathematics 1 CBCGS 2016-2017 BE Civil Engineering Semester 1 (FE First Year) Question Paper Solution

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Applied Mathematics 1 [CBCGS]
Marks: 80 University of Mumbai
BE Civil Engineering
BE Computer Engineering
BE Mechanical Engineering
BE Biotechnology
BE Marine Engineering
BE Printing and Packaging Technology
BE Production Engineering
BE IT (Information Technology)
BE Electrical Engineering
BE Electronics and Telecommunication Engineering
BE Instrumentation Engineering
BE Electronics Engineering
BE Chemical Engineering
BE Construction Engineering
BE Biomedical Engineering
BE Automobile Engineering

Academic Year: 2016-2017
Date: December 2016
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(1) Question no. 1 is compulsory.
(2) Attempt any 3 questions from remaining five questions.


[20]1
[3]1.a

If `cos alpha cos beta=x/2, sinalpha sinbeta=y/2`, prove that:

`sec(alpha -ibeta)+sec(alpha-ibeta)=(4x)/(x^2-y^2)`

Concept: undefined - undefined
Chapter: [5] Complex Numbers
[3]1.b

If `z =log(e^x+e^y) "show that rt" - s^2 = 0  "where r"= (del^2z)/(delx^2),t=(del^2z)/(dely^2)"s"=(del^2z)/(delx dely)`

Concept: undefined - undefined
Chapter: [5] Complex Numbers
[3]1.c

If x = uv, y `=(u+v)/(u-v).`find `(del(u,v))/(del(x,y))`.

Concept: undefined - undefined
Chapter: [5] Complex Numbers
[3]1.d

If `y=2^xsin^2x cosx` find `y_n`

Concept: undefined - undefined
Chapter: [5] Complex Numbers
[4]1.e

Express the matrix as the sum of symmetric and skew symmetric matrices.

Concept: undefined - undefined
Chapter: [7] Matrices
[4]1.f

Evaluat `lim_(x->0) (e^(2x)-(1+x)^2)/(xlog(1+x)`

Concept: undefined - undefined
Chapter: [10] Indeterminate Forms, Numerical Solutions of Transcendental Equations and System of Linear Equations
[20]2
[6]2.a

Show that the roots of x5 =1 can be written as 1, `alpha^1,alpha^2,alpha^3,alpha^4` .hence show that `(1-alpha^1) (1-alpha^2) (1-alpha^3)(1-alpha^4)=5.`

Concept: undefined - undefined
Chapter: [5] Complex Numbers
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[6]2.b

Reduce the following matrix to its normal form and hence find its rank.

Concept: undefined - undefined
Chapter: [7] Matrices
[8]2.c

Solve the following equation by Gauss-Seidel method upto four iterations

4x-2y-z=40, x-6y+2y=-28, x-2y+12z=-86.

Concept: undefined - undefined
Chapter: [10] Indeterminate Forms, Numerical Solutions of Transcendental Equations and System of Linear Equations
[20]3
[6]3.a

Investigate for what values of μ and λ the equations x+y+z=6, x+2y+3z=10, x+2y+λz=μ has
1) No solution
2) A unique solution
3) Infinite number of solutions. 

Concept: undefined - undefined
Chapter: [7] Matrices
[6]3.b

If `u=x^2+y^2+z^2` where `x=e^t, y=e^tsint,z=e^tcost`

Prove that `(du)/(dt)=4e^(2t)`

Concept: undefined - undefined
Chapter: [5] Complex Numbers
[4]3.c

Show that `sin(e^x-1)=x^1+x^2/2-(5x^4)/24+`...................

Concept: undefined - undefined
Chapter: [9] Applications of Partial Differentiation , Expansion of Functions
[4]3.d

Expand `2x^3+7x^2+x-6` in powers of (x-2)

Concept: undefined - undefined
Chapter: [5] Complex Numbers
[20]4
[6]4.a

If x = u+v+w, y = uv+vw+uw, z = uvw and φ is a function of x, y and z
Prove that

Concept: undefined - undefined
Chapter: [8] Partial Differentiation
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[6]4.b

If tan(θ+iφ)=tanα+isecα
Prove that
1)`e^(2varphi)=cot(varphi/2)`
2) `2theta=npi+pi/2+alpha`

Concept: undefined - undefined
Chapter: [8] Partial Differentiation
[8]4.c

Find the roots of the equation `x^4+x^3 -7x^2-x+5 = 0` which lies between 2 and 2.1 correct to 3 places of decimals using Regula Falsi method.

Concept: undefined - undefined
Chapter: [10] Indeterminate Forms, Numerical Solutions of Transcendental Equations and System of Linear Equations
[20]5
[6]5.a

If y=(x+√x2-1 ,Prove that

`(x^2-1)y_(n+2)+(2n+1)xy_(n+1)+(n^2-m^2)y_n=0`

Concept: undefined - undefined
Chapter: [6.01] Successive Differentiation
[6]5.b

Using the encoding matrix `[(1,1),(0,1)]` encode and decode the messag I*LOVE*MUMBAI.

Concept: undefined - undefined
Chapter: [7] Matrices
[4]5.c

Considering only principal values separate into real and imaginary parts

`i^((log)(i+1))`

Concept: undefined - undefined
Chapter: [6.02] Logarithm of Complex Numbers
[4]5.d

Show that `ilog((x-i)/(x+i))=pi-2tan6-1x`

Concept: undefined - undefined
Chapter: [6.02] Logarithm of Complex Numbers
[20]6
[6]6.a

Using De Moivre’s theorem prove that]

`cos^6theta-sin^6theta=1/16(cos6theta+15cos2theta)`

Concept: undefined - undefined
Chapter: [5] Complex Numbers
[6]6.b

If u `=sin^(-1)((x^(1/3)+y^(1/3))/(x^(1/2)-y^(1/2)))`, Prove that 

`x^2(del^2u)/(delx^2)+2xy(del^2u)/(delxdely)+y^2(del^2u)/(dely^2)=tanu/144(tan^2u+13)`

Concept: undefined - undefined
Chapter: [7] Matrices
[8]6.c

Find the maxima and minima of `x^3 y^2(1-x-y)`

Concept: undefined - undefined
Chapter: [9] Applications of Partial Differentiation , Expansion of Functions

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