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# Question Paper Solutions for Mathematics All India Set 1 2017-2018 CBSE (Science) Class 12

#### Alternate Sets

Marks: 100
[1]1

Find the magnitude of each of two vectors veca and vecb having the same magnitude such that the angle between them is 60° and their scalar product is 9/2

Chapter: [4.02] Vectors
Concept: Product of Two Vectors - Scalar (Or Dot) Product of Two Vectors
[1]2

Find the value of tan^(-1) sqrt3 - cot^(-1) (-sqrt3)

Chapter: [1.02] Inverse Trigonometric Functions
Concept: Inverse Trigonometric Functions - Inverse Trigonometric Functions - Principal Value Branch
[1]3

If a * b denotes the larger of 'a' and 'b' and if a∘b = (a * b) + 3, then write the value of (5)∘(10), where * and ∘ are binary operations.

Chapter: [1.01] Relations and Functions
Concept: Concept of Binary Operations
[1]4

if the matrix A =[(0,a,-3),(2,0,-1),(b,1,0)] is skew symmetric, Find the value of 'a' and 'b'

Chapter: [2.01] Matrices
Concept: Types of Matrices
[2]5

A black and a red dice are rolled.  Find the conditional probability of obtaining the sum 8, given that the red die resulted in a number less than 4.

Chapter: [6.01] Probability
Concept: Conditional Probability
[2]6

If θ is the angle between two vectors hati - 2hatj + 3hatk and 3hati - 2hatj + hatk find sin theta

Chapter: [4.02] Vectors
Concept: Product of Two Vectors - Vector (Or Cross) Product of Two Vectors
[2]7

Find the differential equation representing the family of curves y = ae^(bx + 5). where a and b are arbitrary constants.

Chapter: [3.03] Differential Equations
Concept: Formation of a Differential Equation Whose General Solution is Given
[2]8

Evaluate : $\int\frac{\cos 2x + 2 \sin^2 x}{\cos^2 x}dx$ .

Chapter: [3.01] Integrals
Concept: Indefinite Integral Problems
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