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# C2 trig help Watch

1. Solve:

Okay so I draw my quadrant diagram like this:

thanks
2. Go round again. cos (stuff) = cos (stuff+360)
4. (Original post by GreigM)
Is this the case for cos, sine or tangent?

5. (Original post by upthegunners)
Is this the case for cos, sine or tangent?

it is the same for all of them.
6. (Original post by GreigM)
it is the same for all of them.
I heard that you add 180deg to the tan function as it's period is 180?
7. (Original post by upthegunners)
I heard that you add 180deg to the tan function as it's period is 180?
You're probably right. I haven't learned for tan yet as I'm with the Scottish education system

I will post my working to it underneath.

8. Am I right because if not I need to do all of this again 😞

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9. (Original post by upthegunners)
I heard that you add 180deg to the tan function as it's period is 180?
In the example that you showed you had the 2 solutions less than 360

If you had both of them for Tan then the rule of adding 360 to both answers still applies
10. (Original post by GreigM)

Am I right because if not I need to do all of this again
You are correct

We do not advise posting complete solutions

I understand that you wanted to check your own understanding but it would be better to hide your solution using a
Spoiler:
Show
see
11. (Original post by TenOfThem)
In the example that you showed you had the 2 solutions less than 360

If you had both of them for Tan then the rule of adding 360 to both answers still applies
So in what situations do we not add 360?
12. (Original post by upthegunners)
So in what situations do we not add 360?
I do not really understand your question

If you have a solution you can always add 360 to get another solution
13. (Original post by upthegunners)
Is this the case for cos, sine or tangent?

The period of the tan graph is 180 degrees.

The period of the sin and cos graphs is 360 degrees.
14. (Original post by Mr M)
The period of the tan graph is 180 degrees.

The period of the sin and cos graphs is 360 degrees.
so to get another solution for a tan function we add 180 and NOT 360?
15. (Original post by upthegunners)
so to get another solution for a tan function we add 180 and NOT 360?
360 will get you another answer but you will obviously miss one out!
16. (Original post by upthegunners)
so to get another solution for a tan function we add 180 and NOT 360?
17. (Original post by TenOfThem)
I do not really understand your question

If you have a solution you can always add 360 to get another solution
from the that persons solutions I can see they DO NOT add 360/2pi degrees

If I add 2pi to pi/6 I get 13pi/6 not 5pi/5

what am I doing wrong?

thanks
18. (Original post by upthegunners)
from the that persons solutions I can see they DO NOT add 360/2pi degrees

If I add 2pi to pi/6 I get 13pi/6 not 5pi/5

what am I doing wrong?

thanks
The limit states that x is not greater than 2pi
19. (Original post by upthegunners)
from the that persons solutions I can see they DO NOT add 360/2pi degrees

If I add 2pi to pi/6 I get 13pi/6 not 5pi/5

what am I doing wrong?

thanks
Why are you adding 2pi to pi/6

arc cos 1/2 = pi/3
20. (Original post by .raiden.)
The limit states that x is not greater than 2pi
then what are we adding on to get these values?

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