જો $\sin x + \cos x = a$,જ્યાં $a \in [-\sqrt{2}, \sqrt{2}] - \{-1, 1\}$,હોય તો $\sum_{n=1}^{\infty} (\sin^n x + \cos^n x)$ ની કિંમત શોધો.

  • A
    $\frac{2(1 + a - a^2)}{(a + 1)^2}$
  • B
    $\frac{2(a^2 - a + 1)}{(a - 1)^2}$
  • C
    $\frac{2(a^2 - a + 1)}{(a + 1)^2}$
  • D
    $\frac{2(1 + a - a^2)}{(a - 1)^2}$

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$\cos \frac{2 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{6 \pi}{7}+\cos \frac{7 \pi}{7}$ ની કિંમત શોધો.

ધારો કે $\frac{\pi}{2} < x < \pi$ એવું છે કે જેથી $\cot x = \frac{-5}{\sqrt{11}}$. તો $\left(\sin \frac{11x}{2}\right)(\sin 6x - \cos 6x) + \left(\cos \frac{11x}{2}\right)(\sin 6x + \cos 6x)$ ની કિંમત શોધો.

ધારો કે $S = \{x \in \left(-\frac{\pi}{2}, \frac{\pi}{2}\right) : 9^{1-\tan^2 x} + 9^{\tan^2 x} = 10\}$ અને $\beta = \sum_{x \in S} \tan^2\left(\frac{x}{3}\right)$,તો $\frac{1}{6}(\beta - 14)^2$ ની કિંમત શોધો.

જો $e^{-\pi / 2} < \theta < \pi / 2$ હોય,તો $\cos (\log \theta)$ અને $\log (\cos \theta)$ માંથી મોટી કિંમત કઈ છે?

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