જો $\sin \theta + \sin^2 \theta = 1$ અને $\cos^{12} \theta + a \cos^{10} \theta + b \cos^8 \theta + c \cos^6 \theta + d = 0$ હોય,તો:

  • A
    $ab = cd$
  • B
    $ac = bd$
  • C
    $ab + cd = 0$
  • D
    $ac + bd = 0$

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જો $\tanh ^2 x = \tan ^2 \theta$ હોય,તો $\cosh 2x =$

${\left( \frac{\cos A + \cos B}{\sin A - \sin B} \right)^n} + {\left( \frac{\sin A + \sin B}{\cos A - \cos B} \right)^n}$ ($n$ એ પૂર્ણાંક છે) $=$

ધારો કે $\alpha, \beta$ બે વાસ્તવિક સંખ્યાઓ છે જેથી $\pi < (\alpha-\beta) < 3 \pi$. જો $\sin \alpha+\sin \beta=\frac{-21}{65}$ અને $\cos \alpha+\cos \beta=\frac{-27}{65}$ હોય,તો $\cos \left(\frac{\beta-\alpha}{2}\right)=$

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જો $(m + 2)\sin \theta + (2m - 1)\cos \theta = 2m + 1$ હોય,તો નીચેનામાંથી કયું સાચું છે?

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