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# Question-Answer

**Qus. Algebra:**What is algebra?

Answers to 'Algebra'

Algebra may divided into "classical algebra" (equation solving or "find the unknown number" problems) and "abstract algebra", also called "modern algebra" (the study of groups, rings, and fields). Classical algebra has been developed over a period of 4000 years. Abstract algebra has only appeared in the last 200 years.
The development of algebra is outlined in these notes under the following headings: Egyptian algebra, Babylonian algebra, Greek geometric algebra, Diophantine algebra, Hindu algebra, Arabic algebra, European algebra since 1500, and modern algebra. Since algebra grows out of arithmetic, recognition of new numbers - irrationals, zero, negative numbers, and complex numbers - is an important part of its history.
The development of algebraic notation progressed through three stages: the rhetorical (or verbal) stage, the syncopated stage (in which abbreviated words were used), and the symbolic stage with which we are all familiar.

**Qus. Trigonometry:**Solve Sin 75 cos 15 + cos 75 sin 15 =?

Answers to 'Trigonometry'

sin (A+B) = sin A cos B + cos A sin B

Here A = 75 and B = 15

Therefore sin 75 cos 15 + cos 75 sin 15 = sin (75 + 15)

= sin 90

= 1

Here A = 75 and B = 15

Therefore sin 75 cos 15 + cos 75 sin 15 = sin (75 + 15)

= sin 90

= 1

**Qus. Algebra:**Find the sum of numbers from 1 to 100.

Answers to 'Algebra'

formula for finding sum up to given limit from 1 is

sum=n*(n+1)/2

n=100

sum=100*(100+1)/2

=5050

sum=n*(n+1)/2

n=100

sum=100*(100+1)/2

=5050

**Qus. Algebra:**What does '!' mean in maths?

Answers to 'Algebra'

'!' means factorial of a number.

n! = n(n - 1)(n - 2)(n - 3) ..........3.2.1

0! = 1

1! = 1 x 0! = 1 x 1 = 1

2! = 2 x 1 x 0! = 2

n! = n(n - 1)(n - 2)(n - 3) ..........3.2.1

0! = 1

1! = 1 x 0! = 1 x 1 = 1

2! = 2 x 1 x 0! = 2

**Qus. Algebra:**Solve the linear equation -13 + 4 = 5x + 4x?