- Kuadran I sudut antara 0˚ sampai 90˚ atau (0˚<a£ 90˚)
- Kuadran II sudut antara 90˚ sampai 180˚ atau (90˚<a£ 180˚)
- Kuadran III sudut antara 180˚ sampai 270˚ atau (180˚<a£ 270˚)
- Kuadran IV sudut antara 270˚ sampai 360˚ atau (270˚<a£ 360˚)
1. KUADRAN
I
sin
(90˚- a
) = cos a
cos
(90˚- a
) = sin a
tan
(90˚- a ) = cot a
csc
(90˚- a ) = sec a
sec
(90˚- a ) = csc a
cot
(90˚- a )= tan a
2. KUADRAN II
sin (180˚- a
) = sin a atau sin (90˚+ a) = cos a
cos (180˚- a
) = - cos a cos (90˚+ a)
= - sin a
tan (180˚- a
) = - tan a tan (90˚+ a)
= - cot a
csc (180˚- a
) = csc a csc
(90˚+ a) = sec a
sec (180˚- a
) = - sec a sec (90˚+ a)
= - csc a
cot (180˚- a ) = - cot a cot (90˚+ a) = - tan a3. KUADRAN III
sin (180˚+ a
) = - sin a atau sin (270˚- a) = - cos a
cos (180˚+ a
) = - cos a cos (270˚- a) = - sin a
tan (180˚+ a
) = tan a tan (270˚- a)
= cot a
csc (180˚+ a
) = - csc a csc (270˚- a) = - sec a
sec (180˚+ a
) = - sec a sec (270˚- a) = - csc a
cot (180˚+ a
) = cot a cot (270˚- a)
= tan a
4. KUADRAN
III
sin (180˚+ a
) = - sin a atau sin (270˚- a) = - cos a
cos (180˚+ a
) = - cos a cos (270˚- a) = - sin a
tan (180˚+ a
) = tan a tan (270˚- a)
= cot a
csc (180˚+ a
) = - csc a csc (270˚- a) = - sec a
sec (180˚+ a
) = - sec a sec (270˚- a) = - csc a
cot (180˚+ a
) = cot a cot (270˚- a)
= tan a
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