જો $\cos \alpha + \cos \beta = a$,$\sin \alpha + \sin \beta = b$ અને $\alpha - \beta = 2 \theta$ હોય,તો $\frac{\cos 3 \theta}{\cos \theta} = $

  • A
    $a^2 + b^2 - 2$
  • B
    $a^2 + b^2 - 3$
  • C
    $3 - a^2 - b^2$
  • D
    $\frac{a^2 + b^2}{4}$

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ગુણાકારની કિંમત શોધો: $\left(1+\cos \frac{\pi}{8}\right)\left(1+\cos \frac{2 \pi}{8}\right)\left(1+\cos \frac{3 \pi}{8}\right)\left(1+\cos \frac{4 \pi}{8}\right)\left(1+\cos \frac{5 \pi}{8}\right)\left(1+\cos \frac{6 \pi}{8}\right)\left(1+\cos \frac{7 \pi}{8}\right)$

કિંમત શોધો: $\cos \frac{\pi}{7} \cos \frac{2 \pi}{7} \cos \frac{3 \pi}{7} \cos \frac{\pi}{14} \cos \frac{3 \pi}{14} \cos \frac{5 \pi}{14}$

જો $a \cos^3 \alpha + 3a \cos \alpha \sin^2 \alpha = m$ અને $a \sin^3 \alpha + 3a \cos^2 \alpha \sin \alpha = n$ હોય,તો $(m + n)^{2/3} + (m - n)^{2/3}$ ની કિંમત શોધો:

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જો $\tan {3^o} + 2\tan {6^o} + 4\tan {12^o} + 8\cot {24^o} = \cot {\theta ^o}$ હોય,તો:

$\cot 18^{\circ} \cdot \cot 36^{\circ}+1=$

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