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Find 
(dy)/(dx) where 
y=csc^(-1)(2x^(4)+6).

Find dydx \frac{d y}{d x} where y=csc1(2x4+6) y=\csc ^{-1}\left(2 x^{4}+6\right) .

Full solution

Q. Find dydx \frac{d y}{d x} where y=csc1(2x4+6) y=\csc ^{-1}\left(2 x^{4}+6\right) .
  1. Understand the function: Understand the function and what is being asked.\newlineWe need to find the derivative of yy with respect to xx, where y=csc1(2x4+6)y = \csc^{-1}(2x^4 + 6). This is an application of implicit differentiation and the chain rule.
  2. Differentiate both sides: Differentiate both sides of the equation with respect to xx. Starting with y=csc1(2x4+6)y = \csc^{-1}(2x^4 + 6), we differentiate both sides with respect to xx. The left side becomes dydx\frac{dy}{dx}, and the right side requires the use of the chain rule.
  3. Apply inverse cosecant derivative: Apply the derivative of the inverse cosecant function.\newlineThe derivative of csc1(u)\csc^{-1}(u) with respect to uu is 1(uu21)-\frac{1}{(|u|\sqrt{u^2 - 1})}, where uu is a function of xx. In this case, u=2x4+6u = 2x^4 + 6.
  4. Apply the chain rule: Apply the chain rule.\newlineNow we need to multiply the derivative of csc1(u)\csc^{-1}(u) by the derivative of uu with respect to xx, which is ddx(2x4+6)=8x3\frac{d}{dx}(2x^4 + 6) = 8x^3.
  5. Combine to find dy/dx: Combine the results to find dy/dx.\newlineSo, dy/dx=12x4+6(2x4+6)218x3dy/dx = -\frac{1}{\left|2x^4 + 6\right|\sqrt{\left(2x^4 + 6\right)^2 - 1}} \cdot 8x^3.
  6. Simplify the expression: Simplify the expression.\newlineSince 2x4+62x^4 + 6 is always positive for all real xx, we can remove the absolute value. Also, we can expand the square and subtract 11 inside the square root.\newlinedydx=8x3(2x4+6)(2x4+6)21\frac{dy}{dx} = \frac{-8x^3}{(2x^4 + 6)\sqrt{(2x^4 + 6)^2 - 1}}.
  7. Further simplify if possible: Further simplify the expression if possible.\newlineThe expression is already in its simplest form, so no further simplification is needed.

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