If cos(xy)=y−1\cos(xy) = y - 1cos(xy)=y−1, what is the value of dydx\dfrac{dy}{dx}dxdy at the point (π2,1)\left(\dfrac{\pi}{2}, 1\right)(2π,1)?
000
−22−π\dfrac{-2}{2 - \pi}2−π−2
22−π\dfrac{2}{2 - \pi}2−π2
−22+π\dfrac{-2}{2 + \pi}2+π−2
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