Basics Flashcards
What is the reference angle
Always between zero and 90°
Angle starts from X axis and origin into any quadrant
Example the reference angle for 170° is 10°
Find a positive and negative coterminal angle
Just add +/-360°
Or
+/- 2*pi
How do you convert degrees to radians
Just multiply by pi / 180
How do you convert from radians to degrees
Just multiply by 180 / pi
Right triangle ratio for sin
=O/H
Right triangle ratio for cos
=A/H
Right triangle ratio for tan
=O/A
Right triangle ratio for CSC
=H/O
Just think 1/sin
Right triangle ratio for SEC
=H/A
Just think 1/cos
Right triangle ratio for COT
=A/O
What is the reciprocal to the following trig function?
COT
1/TAN
What is the reciprocal to the following trig function?
SEC
1/COS
What is the reciprocal to the following trig function?
CSC
1/SIN
State which quadrant is described
SIN > 1 and COS > 1
I
State which quadrant is described
SIN > 1 and COS < 1
II
State which quadrant is described
SIN < 1 and COS < 1
III
What are the maximum and minimum values for
Y = SIN X and Y = COS X
-1 and 1
What is the period for
Y = SIN X and Y = COS X
360°
What are the zeros for
Y = SIN X and Y = COS X
0 and 180
Convert 180° to radians
pi
180 * pi / 180
Define the popular divisions in the first quadrant of the unit circle:
Radians
0 Pi/6 Pi/4 Pi/3 Pi/2
Define the popular divisions in the first quadrant of the unit circle:
degrees
0 30 45 60 90
Define the popular divisions in the first quadrant of the unit circle:
fractions
1,0 Sqr(3)/2 , 1/2 Sqr(2)/2 , Sqr(2)/2 1/2 , Sqr(3)/2 0,1
