Some questions (1 Viewer)

PhiL

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Apr 4, 2003
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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

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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

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ya....think i did something wrong...coz our teacher said we DONT need to remember the stupid formula!
 

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