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trigonometric funcklsladlysa argh (1 Viewer)

bouncing

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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)
 
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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)...
 
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kcqn93

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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

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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

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

kcqn93

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

bouncing

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

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