trigonometric funcklsladlysa argh (1 Viewer)

[bouncing]

OKAY HELP AGAIN PLEASE

1) consider the curve,
i) show that the curave has 3 stt points int eh domain and find their ordinates
ii) determine the nature
iii) find x intercepts

2) a sector of a circle of raidus r cm has a perimiter of 8cm when the angel at the centre is theta raidans
i) find a relationship betwen r and theta
ii) for , find teh max area of teh sector and value of theta for which this occurs

I WILL LOVE U FOREVER THHANKS (L)

 

[ohexploitable]

lol us 11ers can't help you now!

 

[ohexploitable]

I haven't done this sort of maths before but using my year 10 maths, are the x-intercepts 0 and pi/2?

Probably wrong...

Oh wait... lol... I did y=(sinx+1)/(2sin2x)...

 

[kcqn93]

are you sure you wrote the first question right? the domain would have to be 0 < x < 2pi for it to have 3 stationary points

 

[kcqn93]

1)
i0








I let a = cos x, solve quadratic



using the ASTC thingo


ii)

.....

max (pi/3, 3sqrt3 /2)
min (5pi/3, 3sqrt3 /2
inflexion(pi,0)

iii)



...

let y = 0

...

x = 0, x = pi, x= 2pi



lol i got lazy... i might be wrong havent done 2unit maths in a while

 

[bouncing]

yeah nvm i got it
got the same values as you so yay i hope you are right

 

[kcqn93]

haha i hope i'm right.. took me like 20 minutes to put it into latex hahaha procrastinating bydoing maths on bos :mad1:

 

[bouncing]

lol yep.... id o that too except usually i am of no help ......... :'(

 

[hscishard]

lol us 11ers can't help you now!

Lol yea. I'm almost up to Trig in Cam though.