જો $x \sin^3 \alpha + y \cos^3 \alpha = \sin \alpha \cos \alpha$ અને $x \sin \alpha - y \cos \alpha = 0$ હોય,તો $x^2 + y^2 = $

  • A
    $-1$
  • B
    $\pm 1$
  • C
    $1$
  • D
    આમાંથી કોઈ નહીં

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જો $\sin \theta + \cos \theta = m$ અને $\sec \theta + \csc \theta = n$ હોય,તો $n(m + 1)(m - 1) = $

$2\sin^2 \beta + 4\cos(\alpha + \beta)\sin \alpha \sin \beta + \cos 2(\alpha + \beta) = $

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