Question 270288
I need to find the derivative of these two questions. Can you please help me? 
y= tan^-1 (x/2)
y' = (1/2)*1/(1 + (x/2)^2) = 1/(2*(1 + x^2/4))
y' = 1/(2*(4+x^2)/4) = 1/((x^2+4)/2)
y' = 2/(x^2 + 4)
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y= 2square root x subtract 1/2squarerootx
{{{y = 2x^(1/2) - (1/2)*x^(-1/2)}}} ?? some ambiguity in the problem stated
y' = x^(-1/2) + (1/4)x^(-3/2)
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y' = {{{sqrt(x)*(4x+1)/(4x^2)}}}