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Editor
 Sep 18, 2022
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If $y=(4-9x^{4})^{\frac{1}{2}}$ then dy/dx equals:
Difficulty: Easy
A: 
$-18x^{3}(4-9x^{4})^{-\frac{1}{2}}$
B: 
$2(4-9x^{4})^{-\frac{1}{2}}$
C: 
$\frac{1}{2}(4-9x^{4})^{-\frac{1}{2}}$
D: 
$-\frac{9}{2}(4-9x^{4})^{-\frac{1}{2}}$
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