જો $xy = \tan^{-1}(xy) + \cot^{-1}(xy)$ હોય,તો $\left(\frac{dy}{dx}\right)_{(4,2)} = ?$ (જ્યાં $x, y \in \mathbb{R}$)

  • A
    $\frac{-1}{2}$
  • B
    $-2$
  • C
    $2$
  • D
    $\frac{1}{2}$

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વિધેય $xy = e^{(x-y)}$ માટે $\frac{dy}{dx}$ શોધો.

ધારો કે $f(x), x \in [0, \infty)$ એ એક અ-ઋણ સતત વિધેય છે. જો $f'(x) \cos x \le f(x) \sin x$ એ દરેક $x \ge 0$ માટે હોય,તો $f(2\pi)$ ની કિંમત કેટલી થાય?

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