(i) HORIZONTAL METHOD In this method all expressions are written in a horizontal line and then the terms are arranged to collect all the group of like terms and then added.

COLUMN METHOD In this method each expression is written in a separate row such that like terms are arranged one below the other in a column.The the addition of terms is done column wise.

Express all the ratios in the terms of tangent.

The first term of an infinite G..P is 1 and any term is equal to the sum of all the succeeding terms. Find the series.

The differential equation of all non-horizontal lines in a plane is

The collective term for condesed horizontal underground stem is

Find the rank of YAMAN if all the letter of the word are arranged in all possible order and written out as in a dictionary.