Page 40 - modul trigonometri bilingual

cos
= = = cot
sin

Comparative Identity

sin
= tan
cos
cos
= cot
sin

3. Pythagoras Identity
In the right triangle applies the following Pythagorean theorem.
The sum of the squares of the sides of the elbows is equal to the

square of the oblique side.
2
2
2
↔ + =

2
a. The two segments of the equation (1) are divided by
2
+ 2 2
=
2 2
2 2
↔ ( ) + ( ) = 1

2
2
↔ + = 1

2
b. The two segments of the equation (1) are divided by
2
+ 2 2
=
2 2
2 2
↔ ( ) + 1 = ( )

2
2
↔ + 1 =
2
2
↔ 1 + =
2
c. The two segments of the equation (1) are divided by
2
+ 2 2
=
2
2 2
↔ 1 + ( ) = ( )

2
2
↔ 1 + =

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