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Some questions (1 Viewer)

PhiL

Member
Joined
Apr 4, 2003
Messages
56
Can anyone answer any of these questions please, im not sure if they were right or not:
2b. d/dx(inverseCOS(3x^2))
2e (parts i and ii)
and what was the value of x in question 2C.
Thank u
 

PhiL

Member
Joined
Apr 4, 2003
Messages
56
Sweet_Lemon said:
x is 5. something~~ can't remeber~~ it's like 144=7x^2
For this question i thought the answer was x=9
cause (7+x)x=12^2
(x+16)(x-9)
therefore x=9???
 

Sweet_Lemon

Final Sem'
Joined
Mar 1, 2004
Messages
1,447
Location
Metro SYD
Gender
Female
HSC
2004
ya....think i did something wrong...coz our teacher said we DONT need to remember the stupid formula!
 

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