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# Is this correct? trigonometry watch

1. this is my worst topic lol
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2. a) You've made a mistake on the third line.
b) Looks correct.
3. How do i do a?
(Original post by morgan8002)
a) You've made a mistake on the third line.
b) Looks correct.
4. A tip - you don't necessarily have to draw a graph for tanx
You know that you just add 180 or minus 180 each time
5. (Original post by schindlers list)
How do i do a?
Find all of the possible values of 2x between 0 and 720, then divide each by two.
6. (Original post by morgan8002)
Find all of the possible values of 2x between 0 and 720, then divide each by two.
I dont understand
7. (Original post by Mary562)
A tip - you don't necessarily have to draw a graph for tanx
You know that you just add 180 or minus 180 each time
Thanks
8. (Original post by schindlers list)
Thanks
You're welcome
Sorry and another thing keep your work neat it looks a little messy
9. (Original post by schindlers list)
I dont understand
For simplicity let's say y = 2x.
Therefore cos(y) = 0.5.
Find all of the values of y that satisfy this.
y = 60, 300, 420, 660
2x = 60, 300, 420, 660
x = 30, 150, 210, 330
10. Thanks
(Original post by morgan8002)
For simplicity let's say y = 2x.
Therefore cos(y) = 0.5.
Find all of the values of y that satisfy this.
y = 60, 300, 420, 660
2x = 60, 300, 420, 660
x = 30, 150, 210, 330

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