Solve x^199/x^200+100

$$\frac { x ^ { 199 } } { x ^ { 200 } + 100 }$$

Differentiate w.r.t. x

$$\frac{x^{198}\left(19900-x^{200}\right)}{\left(x^{200}+100\right)^{2}}$$

Steps Using Derivative Rule for Quotient

For any two differentiable functions, the derivative of the quotient of two functions is the denominator times the derivative of the numerator minus the numerator times the derivative of the denominator, all divided by the denominator squared.

$$\frac{\left(x^{200}+100\right)\frac{\mathrm{d}}{\mathrm{d}x}(x^{199})-x^{199}\frac{\mathrm{d}}{\mathrm{d}x}(x^{200}+100)}{\left(x^{200}+100\right)^{2}}$$

The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.

$$\frac{\left(x^{200}+100\right)\times 199x^{199-1}-x^{199}\times 200x^{200-1}}{\left(x^{200}+100\right)^{2}}$$

Do the arithmetic.

$$\frac{\left(x^{200}+100\right)\times 199x^{198}-x^{199}\times 200x^{199}}{\left(x^{200}+100\right)^{2}}$$

Expand using distributive property.

$$\frac{x^{200}\times 199x^{198}+100\times 199x^{198}-x^{199}\times 200x^{199}}{\left(x^{200}+100\right)^{2}}$$

To multiply powers of the same base, add their exponents.

$$\frac{199x^{200+198}+100\times 199x^{198}-200x^{199+199}}{\left(x^{200}+100\right)^{2}}$$

Do the arithmetic.

$$\frac{199x^{398}+19900x^{198}-200x^{398}}{\left(x^{200}+100\right)^{2}}$$

Combine like terms.

$$\frac{\left(199-200\right)x^{398}+19900x^{198}}{\left(x^{200}+100\right)^{2}}$$

Subtract 200 from 199.

$$\frac{-x^{398}+19900x^{198}}{\left(x^{200}+100\right)^{2}}$$

Factor out x^{198}.

$$\frac{x^{198}\left(-x^{200}+19900x^{0}\right)}{\left(x^{200}+100\right)^{2}}$$

For any term t except 0, t^{0}=1.

$$\frac{x^{198}\left(-x^{200}+19900\times 1\right)}{\left(x^{200}+100\right)^{2}}$$

For any term t, t\times 1=t and 1t=t.

$$\frac{x^{198}\left(-x^{200}+19900\right)}{\left(x^{200}+100\right)^{2}}$$

Evaluate

$$\frac{x^{199}}{x^{200}+100}$$