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riadik2000 [5.3K]
3 years ago
7

I need some help with this calculus 1 question

Mathematics
1 answer:
Arada [10]3 years ago
4 0

Step-by-step explanation:

f(x) = x \sqrt{9 -  {x}^{2} }  \\  \therefore \: f(x) = \sqrt{9 {x}^{2}  -  {x}^{4} }  \\ \therefore \: f(x) = ({9 {x}^{2}  -  {x}^{4} } )^{ \frac{1}{2} }  \\ differentiating \: both \: sides \: w.r.t. \: x \\  {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} } \\ \hspace{30 pt} \times (9 \times 2x - 4 {x}^{3} ) \\ \therefore \: {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} }  \\\hspace{32 pt}\times (18x - 4 {x}^{3} )  \\ \therefore \: {f}^{'}(x) =  \frac{1}{2}  \times ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} } \\\hspace{32 pt} \times 2(9x - 2 {x}^{3} )  \\  \therefore \: {f}^{'}(x) = ({9 {x}^{2}  -  {x}^{4} } )^{  - \frac{1}{2} }  \times (9x - 2 {x}^{3} )  \\ \therefore \: {f}^{'}(x) =  \frac{1}{x({9 -  {x}^{2} } )^{   \frac{1}{2} } }  \times x(9 - 2 {x}^{2} )  \\  \\   \:  \:  \:  \:  \:  \: \red{ \boxed{ \bold{\therefore \: {f}^{'}(x) =  \frac{(9 - 2 {x}^{2} ) }{ \sqrt{{9 -  {x}^{2} }}}}}}

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