# Applied Mathematics 1 CBCGS 2018-2019 BE IT (Information Technology) Semester 1 (FE First Year) Question Paper Solution

Applied Mathematics 1 [CBCGS]
Date: December 2018

1) Question No. 1 is compulsory

2) Attempt any 3 questions from remainging five questions.

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 1
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 1.a

Show that sec h-1(sin θ) =log cot (theta/2 ).

Concept: Logarithmic Functions
Chapter: [6.02] Logarithm of Complex Numbers
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 1.b

Show that a matrix A = 1/2[(sqrt2,-isqrt2,0),(isqrt2,-sqrt2,0),(0,0,2)] is unitary.

Concept: Types of Matrices
Chapter:  Matrices
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 1.c

Evaluate lim_(x->0) sinx log x.

Concept: nth derivative of standard functions
Chapter: [6.01] Successive Differentiation
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 1.d

Find the nth derivative of y=eax cos2 x sin x.

Concept: Separation of Real and Imaginary Parts of Logarithmic Functions
Chapter: [6.02] Logarithm of Complex Numbers
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 1.e

If 𝒙 = r cos θ and y= r sin θ prove that JJ-1=1.

Concept: Types of Matrices
Chapter:  Matrices
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 1.f

Using coding matrix A=[(2,1),(3,1)] encode the message THE CROW FLIES AT MIDNIGHT.

Concept: Types of Matrices
Chapter:  Matrices
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 2
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 2.a

Find all values of (1 + i)^(1/3 and show that their continued product is (1+ 𝒊 ).

Concept: Powers and Roots of Trigonometric Functions
Chapter:  Complex Numbers
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 2.b

Find the non-singular matrices P & Q such that PAQ is in normal form where[(1,2,3,4),(2,1,4,3),(3,0,5,-10)]

Concept: Types of Matrices
Chapter:  Matrices
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 2.c

Find maximum and minimum values of x3 +3xy2 -15x2-15y2+72x.

Concept: Maxima and Minima of a Function of Two Independent Variables
Chapter:  Applications of Partial Differentiation , Expansion of Functions
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 3
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 3.a

If U = e^(xyz) f((xy)/z) prove that x(delu)/(delx)+z(delu)/(delx)2xyzu and y(delu)/(delx)+z(delu)/(delz)=2xyzu and hence show that x(del^2u)/(delzdelx)=y(del^2u)/(delzdely)

Concept: Successive Differentiation
Chapter: [6.01] Successive Differentiation
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 3.b

By using Regular falsi method solve 2x – 3sin x – 5 = 0.

Concept: Regula – Falsi Equation
Chapter:  Indeterminate Forms, Numerical Solutions of Transcendental Equations and System of Linear Equations
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 3.c

If y=sin[log(x2+2x+1)] then prove that (x+1)2yn+2 +(2n +1)(x+ 1)yn+1 + (n2+4)yn=0.

Concept: Leibnitz’S Theorem (Without Proof) and Problems
Chapter: [6.01] Successive Differentiation
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 4
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 4.a

State and prove Euler’s Theorem for three variables.

Concept: Euler’s Theorem on Homogeneous functions with two and three independent variables (with proof)
Chapter:  Partial Differentiation
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 4.b

By using De Moivre's Theorem obtain tan 5θ in terms of tan θ and show that 1-10 tan^2(pi/10)+5tan^4(pi/10)=0.

Concept: D’Moivre’S Theorem
Chapter:  Complex Numbers
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 4.c

Investigate for what values of λ and μ the equations
2x + 3y + 5z = 9
7x + 3y - 2z = 8
2x + 3y + λz = μ have
A. No solutions
B. Unique solutions
C. An infinite number of solutions.

Concept: Types of Matrices
Chapter:  Matrices
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 5
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 5.a

Find nth derivative of 1/(x^2+a^2.

Concept: nth derivative of standard functions
Chapter: [6.01] Successive Differentiation
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 5.b

If z = f (x, y) where x = eu +e-v, y = e-u - ev then prove that (delz)/(delu)-(delz)/(delv)=x(delz)/(delx)-y(delz)/(dely).

Concept: Euler’s Theorem on Homogeneous functions with two and three independent variables (with proof)
Chapter:  Partial Differentiation
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 5.c

Solve using Gauss Jacobi Iteration method
2𝒙 + 12y + z – 4w = 13
13𝒙 + 5y - 3z + w = 18
2𝒙 + y – 3z + 9w = 31
3𝒙 - 4y + 10z + w = 29

Concept: Gauss Jacobi Iteration Method
Chapter:  Indeterminate Forms, Numerical Solutions of Transcendental Equations and System of Linear Equations
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 6
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 6.a

If y = log [tan(pi/4+x/2)]Prove that

I. tan hy/2 = tan  pi/2
II. cos hy cos x = 1

Concept: Logarithmic Functions
Chapter: [6.02] Logarithm of Complex Numbers
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 6.b

If U =sin^(-1)[(x^(1/3)+y^(1/3))/(x^(1/2)+y^(1/2))]prove that x^2(del^2u)/(del^2x)+2xy(del^2u)/(delxdely)+y^2(del^2u)/(del^2y)=(tanu)/144[tan^2"U"+13].

Concept: Euler’s Theorem on Homogeneous functions with two and three independent variables (with proof)
Chapter:  Partial Differentiation
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 6.c

Expand 2 𝒙3 + 7 𝒙2 + 𝒙 – 6 in power of (𝒙 – 2) by using Taylors Theorem.

Concept: Taylor’S Series Method
Chapter:  Applications of Partial Differentiation , Expansion of Functions
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 6.d

Expand sec x by McLaurin’s theorem considering up to x4 term.

Concept: Expansion of 𝑒^𝑥 , sin(x), cos(x), tan(x), sinh(x), cosh(x), tanh(x), log(1+x), 𝑠𝑖𝑛−1 (𝑥),𝑐𝑜𝑠−1 (𝑥),𝑡𝑎𝑛−1 (𝑥)
Chapter:  Applications of Partial Differentiation , Expansion of Functions

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