If tan A = 1 and tan B = √ 3, what is the value of cos A . cos B - sin A . sin B?
Given, tan A = 1 ⇒ A = 45° Also given, tan B = √ 3 ⇒ B = 60° ∴ cos A . cos B - sin A . sin B = cos 45° . cos 60° - sin 45° . sin 60° = 1/ √ 2 * 1/2 - 1/ √ 2 . √ 3/2 = (1 - √ 3)/2 √ 2
Select the word which means the same as the group of words given.
Something that cannot be avoided
Pernicious
A person, especially a young one, with exceptional abilities.
Directions: In each question below, word is used in four different ways. Choose the option in which the usage of the word is INCORRECT or INAPPROPRIA...
Select the word which means the same as the group of words given.
A room or building with equipment for doing physical exercise
Tempestuous
Accumulated
Radical
I. Conservatives often "nutpick" liberal arguments, emphasizing voices that are extremely radical and exotic - those that de...
Select the word which means the same as the group of words given.
A person belonging to a foreign country
Select the option that best expresses the meaning of the highlighted group of words.
According to Imperial records a large group of people ...
