$k$ ની કઈ કિંમત માટે $(\cos x + \sin x)^2 + k \sin x \cos x - 1 = 0$ એ નિત્યસમ બને?

  • A
    $-1$
  • B
    $-2$
  • C
    $0$
  • D
    $1$

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જો $\tan \theta + \cot \theta = 5$ હોય,તો $\tan^2 \theta + \cot^2 \theta$ ની કિંમત કેટલી થાય?

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