(adsbygoogle = window.adsbygoogle || []).push({}); Struggling with these two questions, any ideas?

A

1. The problem statement, all variables and given/known data

Differentiate with respect to x

sin^{-1}2x - 4 cos^{-1}[tex]\frac{x}{2}[/tex]

2. Relevant equations

The equations I have in my notes are identical to those derived here...

http://en.wikipedia.org/wiki/Differentiation_of_trigonometric_functions

3. The attempt at a solution

I got

[tex]\frac{1}{1 - 2x}[/tex] + [tex]\frac{8}{2 - x}[/tex]

but I am totally unconvinced by myself!

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B

1. The problem statement, all variables and given/known data

Resolve the vector x= (1,4,-3) along and perpendicular to a = (-2,3,1).

2. Relevant equations

?

3. The attempt at a solution

I dont understand what the question wants me to do...

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Two questions - (a) Differentiating inverse trig function and (b) vector

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