જો $x = a \sin \theta - b \cos \theta$ અને $y = a \cos \theta + b \sin \theta$ હોય,તો નીચેનામાંથી કયું સાચું છે?

  • A
    $x^{2} + y^{2} = a^{2} - b^{2}$
  • B
    $x^{2} + y^{2} = a^{2} + b^{2}$
  • C
    $\frac{x^{2}}{a^{2}} + \frac{y^{2}}{b^{2}} = 1$
  • D
    $\frac{x^{2}}{y^{2}} + \frac{a^{2}}{b^{2}} = 1$

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જો $\sin A + \sin 2A = x$ અને $\cos A + \cos 2A = y$ હોય,તો $({x^2} + {y^2})({x^2} + {y^2} - 3) = $

જો $\sin (\alpha - \beta ) = \frac{1}{2}$ અને $\cos (\alpha + \beta ) = \frac{1}{2}$ હોય,જ્યાં $\alpha$ અને $\beta$ ધન લઘુકોણ છે,તો

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