## anonymous one year ago which is the standard form of the equation with p=18, phi =5pi/4?

1. skullpatrol

2. Haseeb96

Is this question complete ?

3. anonymous

this question is complete.. its trig identities.. so we're going off of the equation x cos phi + y sin phi - p=0

4. Ali0094

what does PHI mean?!!

5. skullpatrol

how was the question complete when you did not give the equation?

6. anonymous

phi looks like this... $\phi$

7. anonymous

because you are just suppose to know it... this was the question lol

8. skullpatrol

|dw:1433104243974:dw|

9. Ali0094

what a hard question...lol

10. anonymous

thats correct @skullpatrol .. and then what i did next was convert the radian 5pi/4 into degrees to make it easier to simplify

11. skullpatrol

good, what did you get?

12. anonymous

i got 225 degrees.. which simplifys each cos and sin to -sqrt2/2 i believe

13. skullpatrol

ok, substitute the value into the equation please :)

14. anonymous

|dw:1433104713424:dw| and then we'd times the whole thing by -2 to further simplify....correct...?

15. skullpatrol

|dw:1433104740209:dw|

16. skullpatrol

what happened to the variable "y"?

17. anonymous

oh sorry i forgot it... lol

18. anonymous

anyway.. id get the final equation $\sqrt{2}x+\sqrt{2}y+36$ right?

19. skullpatrol

that^ is not an equation, it is an expression

20. anonymous

=0 on the end

21. skullpatrol

an equation has an equals sign, right?

22. anonymous

hahaha so ive been told..

23. skullpatrol

and the signs are not right :(

24. anonymous

wait really? whys that

25. skullpatrol

|dw:1433105082303:dw|

26. anonymous

|dw:1433105127782:dw| this is what i did

27. skullpatrol

|dw:1433105213074:dw|

28. anonymous

okay... besides from correcting ever single minor thing.. i believe i did this problem correct. thanks for your time

29. skullpatrol

30. skullpatrol

thanks for trying to learn

31. skullpatrol

I apologize for "correcting every single minor thing..."