Trigonometry

Definition

100

Who found trigonometry? 

Hippachus

200

What is trigonometry 

Trigonometry is the branch of mathematics which deals with triangles, particularly triangles in a plane where one angle of the triangle is 90 degrees. 

300

Meaning of trigonometry 

Trigonometry is derived from Greek words trigonon (three angles) and metron ( measure).

Sides

100

In a right triangle, the shorter sides 

 Legs

200

The longest side (which is the one opposite the right angle) is   

hypotenuse

300

Name basic trigonometric ratios

Sin, cos, tan etc

Values

100

Sin 30

1/2

200

Tan 90

Not defined

300

Cot 60

3½/3

Trigonometric identity

100

Formula shown in anime

Sin²+cos²=1

200

Sec²2A

Identity2 : 1 + tan^2A = sec^2A

300

cosec^2A

Identity3: 1 + cot^2A = cosec^2A