Trigometric Function Rules Flashcards
Recall the three identifies that involve cos 2ß
- Cos2ß= cos^2ß - sin^2ß
- Cos2ß= 2cos^2ß - 1
- Cos2ß= 1- 2sin^2ß
Half angle identify of cos
Cos2/A= +/-((1+cosA)/2)^.5
Half angle identify of tan
Tan(ß/2)= +-((1-cosß)/(1+cosß))^.5
Sin is ___ in the first quadrant
Positive
Cos is ___ in the first quadrant
Positive
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Cos is __ in the 2nd quadrant
Negative
Sin is ____ in the 2nd quadrant
Positive
Cos is ___ in the 3rd quadrant
Negative
Sin is __ in the 3rd quadrant
Negative
Cos is ___ in the 4th quadrant
Positive
Sin is ___ in the 4th quadrant
Negative
Cos of 0 degrees
1
Sin of 0 degrees
0
Cos of 30 degrees
((3)^.5)/2
Sin of 30 degrees
1/2
Cos of 45 degrees
((2)^.5)/2
sin of 45 degrees
((2)^.5)/2
Cos of 60 degrees
1/2
Sin of 60 degrees
(3)^.5
———-
2
Cos of 90 degree
0
Sin of 90 degrees
1
Cos of 120 degrees
-1/2
Sin of 120 degrees
(3)^.5
———
2
Cos of 135
(2)^.5
- ———
2
Sin of 135
(2)^.5
———
2
Cos of 150
(3)^.5
- ———
2
Sin of 150
1/2
Cos of 180
-1
Sin of 180
0
Cos of 210
(3)^.5
- ———
2
Sin of 120
-1/2
Cos of 225
(2)^.5
- ———
2
Sin of 225
(2)^.5
- ———
2
Cos of 240
-1/2
Sin of 240
(3)^.5
- ———
2
Cos of 270
0
Sin of 270
-1
Cos of 300
1/2
Sin of 300
(3)^.5
- ———
2
cos of 315
(2)^.5
———
2
Sin of 315
(2)^.5
- ———
2
cos of 330
(3)^.5
———
2
Sin of 330
-1/2
