# Mathematics -2

OBJECTIVES

• To enable in solving the simultaneous equations with the help of determinant and matrix.
• To make understand the exponential series.
• To enable to calculate the areas of regular polygons , hexagons, octagon, hydraulic mean depth (HMD) of a channel, area occupied by water of circular culvert. excavation work.
• To provide the ability to calculate volume of regular solids like pyramid frustum of pyramid, prismoid, wedge and area of curved surfaces .

SHORT DESCRIPTION
Algebra: Determinants, Matrix, Partial Fractions, Exponential Series.

Trigonometry: Inverse circular functions, Properties of triangle and solution of triangles.
Menstruation: Area of rectangles, squares, triangles, quadrilaterals, parallelograms, rhombus, trapezium, circle, sector, segment; Volume of rectangular solids, prism, parallelepiped , pyramids, cones , spheres, frustum of pyramid and cone; Area of curved surface of prism. Cylinder cone, pyramid and frustum of cone.

DETAIL DESCRIPTION
ALGEBRA :
1 Apply determinants to solve simultaneous equations.
1.1 Expand a third order determinant.
1.2 Define minor and co-factors.
1.3 State the properties of determinants.
1.4 Solve the problems of determinants.
1.5 Apply Cramer’s rule to solve the linear equation.
2 Apply partial fraction to break the numerator and denominator.
2.1 Define matrix, null matrix, unit matrix, square matrix. column matrix, row matrix, inverse matrix, transpose matrix, adjoin matrix, rank of a matrix, singular matrix.
2.2 Explain equality, addition and multiplication of matrix.
2.3 Find the rank of a matrix.
2.4 solve the problems of the following types:
i) Solve the given set of linear equations with the help of matrix.
ii) Find the transpose and adjoin matrix of a given matrix.
3 Solve problems using binomial theorem
3.1 Define proper and improper fractions.
3.2 Resolve in to partial fraction of the followings types :
a) Denominator having a non-repeated linear factor.
b) Denominator having a repeated linear factor.
c) Denominator having a quadratic factors.
d) Denominator having a combination of repeated, non-repeated and quadratic factors.
4 Understand exponential series.
4.1 Define e.
4.2 Prove that e is finite and lies between 2 and 3.
4.3 Prove that e x = + + + ……. to 
4.4 Solve problems of the followings types :
i) + + + ……… to 
ii) + + + + ……. to 

TRIGONOMETRY
5 Apply the concept of inverse circular function.
5.1 Explain the term inverse circular function and principal value of a trigonometrical ratio.
5.2 Deduce mathematically the fundamental relations of different circular functions.
5.3 Convert a given inverse circular function in terms of other functions.
5.4 Prove mathematically
i) tan 1 x + tan 1 y = tan 1 .
ii) tan 1 x + tan 1 y + tan 1 z = tan 1
iii) sin 1 x + sin 1 y = sin 1
iv) 2 tan 1 x = sin 1 =cos1 =tan1
5.5 Solve problems of the following types.
a) 2 tan 1 13 + tan 1 14 = 4
b) cos tan 1 cot sin 1 x = x.
c) Prove that the area of the segment cut from a circle of radius r by a chord at a distance d from the centre is given by K= r 2 cos 1 dr 

6 Apply the principle of properties of triangles.
6.1 Prove the followings identities :
i) asinA = bsinB = csinC =2R .
ii) a 2 = b 2 +c 2  2bc cos A
iii) a = b cos C – c cos B .
v)  = 12 bc sin A.
6.2 Establish the followings.
a) tan =
b) tan = cot
c)  =
6.3 Solve the problems of the following types:
i) Prove cos (B  C) + cos A = bc2R
ii) An object experiences two forces F1 and F2 of magnitude 9 and 13 Newtons with an angle 1000 between their directions. Find the magnitude of the resultant R.
7 Apply the concept of area of triangle.
7.1 Find the area of triangle in the form,
i) A= , a = length of a side of equilateral triangle.
ii) A= , where a= length of equal sides,
c= third side.
iii) A= , where a, b, c = length of the sides of a triangle and 2s is the perimeter of the triangle.
7.2 Use formula in 7.1 to solve problems.

8 Apply the concept of finding areas of quadrilateral & Parallelogram.
8.2 Find the areas of quadrilateral when off sets are given.
8.3 Find the areas of a parallelogram.
8.4 Solve problems using above formulae.

9 Apply the concept of finding areas of rhombus & trapezium.
9.1 Define rhombus & trapezium.
9.2 Find the areas of rhombus when the diagonals are given.
9.3 Find the areas of trapezium in terms of its parallel sides and the perpendicular distance between them.
9.4 Solve problems related to rhombus & trapezium.
10 Apply the concept of finding areas of regular polygon.
10.1 Define a regular polygon.
10.2 Find the area of a regular polygon of n sides, when
i) the length of one side and the radius of inscribed circle are given.
ii) the length of one side and the radius of circumscribed circle are given.
10.3 Find the area of a regular .
a) hexagon
b) octagon
when length of side is given.
10.4 Solve problems of the followings types:
A hexagonal polygon 6 m length of each side has a 20 cm width road surrounded the polygon. Find the area of the road.
11 Understand areas of circle , sector and segment.
11.1 Define circle, circumference, sector and segment.
11.2 Find the circumference and area of a circle when its radius is given.
11.3 Find the area of sector and segment of a circle.
11.4 Solve problems related to the above formulae.
12 Apply the concept of volume of a rectangular solid.
12.1 Define rectangular solid and a cube.
12.2 Find geometrically the volume of a rectangular solid when its length, breadth and height are given.
12.3 Find the volume and diagonal of a cube when side is given.
12.4 Solve problems with the help of 12.2 & 12.3.
13 Apply the concept of the volume of a prism and a parallelepiped.
13.1 Define a prism, parallelepiped and a cylinder.
13.2 Find the volume of prism, parallelepiped and cylinder when base and height are given.
13.3 Solve problems related to 13.2.
14 Apply the concept of the volume of pyramid, cone and sphere.
14.1 Define pyramid, cone and sphere.
14.2 Explain the formula for volume of pyramid, cone and sphere.
14.3 Solve problems related to 14.2.
15 Apply the concept of surface area of prism, cylinder and cone.
15.1 Explain the formulae for areas of curved surfaces of prism cylinder and cone.
15.2 Solve problems related to15.1.