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Find 
(dy)/(dx) where 
y=sin^(-1)((1)/(2x+5)).

Find dydx \frac{d y}{d x} where y=sin1(12x+5) y=\sin ^{-1}\left(\frac{1}{2 x+5}\right) .

Full solution

Q. Find dydx \frac{d y}{d x} where y=sin1(12x+5) y=\sin ^{-1}\left(\frac{1}{2 x+5}\right) .
  1. Identify Functions: We need to find the derivative of yy with respect to xx, where y=sin1(12x+5)y = \sin^{-1}\left(\frac{1}{2x+5}\right). To do this, we will use the chain rule, which states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.
  2. Derivative of Outer Function: First, let's identify the outer function and the inner function. The outer function is sin1(u)\sin^{-1}(u), where uu is the inner function. The inner function is 12x+5\frac{1}{2x+5}.
  3. Derivative of Inner Function: The derivative of sin1(u)\sin^{-1}(u) with respect to uu is 11u2\frac{1}{\sqrt{1-u^2}}. So, we will need to substitute uu with 12x+5\frac{1}{2x+5} and then multiply by the derivative of the inner function.
  4. Combine Derivatives: The derivative of the inner function 12x+5\frac{1}{2x+5} with respect to xx is the derivative of a constant multiple of xx plus a constant. The derivative of 12x+5\frac{1}{2x+5} is 1(2x+5)2-\frac{1}{(2x+5)^2} times the derivative of (2x+5)(2x+5), which is 22.
  5. Simplify Expression: Now we can combine the derivatives of the outer and inner functions. The derivative of yy with respect to xx is 11(12x+5)2×2(2x+5)2\frac{1}{\sqrt{1-\left(\frac{1}{2x+5}\right)^2}} \times \frac{-2}{(2x+5)^2}.
  6. Further Simplification: Simplify the expression by combining the constants and the terms with 2x+52x+5. The derivative of yy with respect to xx is 21(12x+5)2(2x+5)2\frac{-2}{\sqrt{1-\left(\frac{1}{2x+5}\right)^2} \cdot (2x+5)^2}.
  7. Common Denominator: We can further simplify the expression by squaring 12x+5\frac{1}{2x+5} in the square root. This gives us 1(1(2x+5)2)\sqrt{1-\left(\frac{1}{(2x+5)^2}\right)} in the denominator. The derivative of yy with respect to xx is 21(1(2x+5)2)(2x+5)2\frac{-2}{\sqrt{1-\left(\frac{1}{(2x+5)^2}\right)} \cdot (2x+5)^2}.
  8. Final Derivative: Finally, we can simplify the square root expression by finding a common denominator inside the square root. This gives us ((2x+5)21(2x+5)2)\sqrt{\left(\frac{(2x+5)^2-1}{(2x+5)^2}\right)}. The derivative of yy with respect to xx is 2((2x+5)21(2x+5)2)(2x+5)2\frac{-2}{\sqrt{\left(\frac{(2x+5)^2-1}{(2x+5)^2}\right)} \cdot (2x+5)^2}.
  9. Final Derivative: Finally, we can simplify the square root expression by finding a common denominator inside the square root. This gives us ((2x+5)21(2x+5)2)\sqrt{\left(\frac{(2x+5)^2-1}{(2x+5)^2}\right)}. The derivative of yy with respect to xx is 2((2x+5)21(2x+5)2)(2x+5)2\frac{-2}{\sqrt{\left(\frac{(2x+5)^2-1}{(2x+5)^2}\right)} \cdot (2x+5)^2}.We can now simplify the expression by canceling out the (2x+5)2(2x+5)^2 terms in the numerator and the denominator. The final derivative of yy with respect to xx is 2(2x+5)21\frac{-2}{\sqrt{(2x+5)^2-1}}.

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