Page 22 - modul trigonometri bilingual
P. 22
The comparative values of angular trigonometry in each quadrant
are formulated as follows.
a. Quadrant c. Quadrant III
−
sin ° = sin ° = = −
−
cos ° = cos ° = = −
−
tan ° = tan ° = =
−
b. Quadrant d. Quadrant IV
−
sin ° = sin ° = = −
−
cos ° = = − cos ° =
−
tan ° = = − tan ° = = −
−
2. Comparison of Trigonometry Of Correlated Angles
a. Relationship of angle to angle ( ° − )
Look at the following picture.
y = x
1. P’(q,p)
’
r
q
)
90° − 1. P(p , ’
O Q’ Q
′
Suppose it ( , ) is a point shadow ( , ) by mirroring the line
′
= . Known = , angle = , angle = (90° − ) ,
′
and = = .
Angle Angle (90° − )
Note ∆ Note ∆ ′ ′
sin = csc = sin (90° − ) = csc (90° − ) =
cos = sec = cos (90° − ) = sec (90° − ) =
tan = cot = tan (90° − ) = cot (90° − ) =
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