Trigonometry Flashcards
sin30
1/2
cos30
√3/2
tan30
1/√3
sin60
√3/2
cos60
1/2
tan60
√3
sin45
1/√2
cos45
1/√2
tan45
1
What is the range of a the graph y=sinx?
-1≤y≤1
Where does y=sinx hit the x axis?
-180, 0, 180, 360
What is the y intercept of y=sinx?
0
What is the range of y=cosx?
-1≤y≤1
What are the x-intercepts of y=cosx?
-90, 90, 270, 450, 630
What is the y-intercept of y=cosx?
1
What is the range of y=tanx?
There isn’t one
What are the x-intercepts of y=tanx?
-180, 0, 180, 360, 540
What is the y-intercept of y=tanx?
0
Where are the asymptotes of y=tanx?
90, 270, 450
cosθ
tanθ
cosθ
= y
–
x
sin²θ=
1-cos²θ
Sine rule
• Missing angle:
a/sinA = b/sinB = c/sinC
• Missing side:
sinA/a = sinB/b = sinC/c
Cosine rule (used when we know three sides of a triangle or two sides and the angle they inclose)
a² = b²+c²-2bc(cosA)
In a quadrant, sinθ =
y/r
