# trigonometry alevel qs

Watch
Thread starter 1 month ago
#1
0
Thread starter 1 month ago
#2
number 12
0
Thread starter 1 month ago
#3
I already differentiate it then i have no idea the next step... i mean the qs said its parallel to x axis so there is possibility that y=0 but i dont know wht should i do
0
1 month ago
#4
(Original post by deviany)
I already differentiate it then i have no idea the next step... i mean the qs said its parallel to x axis so there is possibility that y=0 but i dont know wht should i do
"where a is a non-zero constant".
0
Thread starter 1 month ago
#5
so -2xy-y^2=0 and i change y to 0. and since a is non zero constant so x will be a?
0
1 month ago
#6
(Original post by deviany)
so -2xy-y^2=0 and i change y to 0. and since a is non zero constant so x will be a?
No, y cannot be zero. If y=0 then a=0 and you are told that a is not zero.
0
Thread starter 1 month ago
#7
then what should i do?
0
1 month ago
#8
(Original post by deviany)
then what should i do?
You have ?

You know y is not zero, so...
0
Thread starter 1 month ago
#9
then it would be 2x=-y
0
1 month ago
#10
(Original post by deviany)
then it would be 2x=-y
Yes. Any point where the tangent is parallel to the x axis must be on the line y = - 2x and also on the original curve. Can you continue from there?
0
Thread starter 1 month ago
#11
yes thank u so much
1
1 month ago
#12
(Original post by deviany)
yes thank u so much
You're welcome.
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### How do you feel about your grades? Are they...

What I expected (114)
25.85%
Better than expected (92)
20.86%
Worse than expected (235)
53.29%