જો $\tan (x + y) + \tan (x - y) = 1$ હોય,તો $\frac{dy}{dx} = $

  • A
    $\frac{\sec^2(x + y) + \sec^2(x - y)}{\sec^2(x + y) - \sec^2(x - y)}$
  • B
    $\frac{\sec^2(x + y) + \sec^2(x - y)}{\sec^2(x - y) - \sec^2(x + y)}$
  • C
    $\frac{\sec^2(x + y) - \sec^2(x - y)}{\sec^2(x + y) + \sec^2(x - y)}$
  • D
    આમાંથી કોઈ નહીં

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