$2\cos^2 \theta - 2\sin^2 \theta = 1$,તો $\theta = \dots \dots ^\circ$

  • A
    $15$
  • B
    $30$
  • C
    $45$
  • D
    $60$

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$\sqrt{3} \csc 20^\circ - \sec 20^\circ = $

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