જો $(\sec A + \tan A)(\sec B + \tan B)(\sec C + \tan C) = (\sec A - \tan A)(\sec B - \tan B)(\sec C - \tan C)$ હોય,તો દરેક બાજુનું મૂલ્ય શું થાય?

  • A
    $1$
  • B
    $-1$
  • C
    $0$
  • D
    $1$ અથવા $-1$

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$\sin ^4 \frac{\pi}{8}+\cos ^4 \frac{\pi}{8}+\sin ^4 \frac{3 \pi}{8}+\cos ^4 \frac{3 \pi}{8}+\sin ^4 \frac{5 \pi}{8}+\cos ^4 \frac{5 \pi}{8}+\sin ^4 \frac{7 \pi}{8}+\cos ^4 \frac{7 \pi}{8}=$

જો $A$ અને $B$ લઘુકોણ હોય જે $3 \cos ^2 A + 2 \cos ^2 B = 4$ અને $\frac{3 \sin A}{\sin B} = \frac{2 \cos B}{\cos A}$ નું સમાધાન કરે,તો $A + 2B =$ ($^{\circ}$ માં)

$\operatorname{sech}^{-1}(\sin \theta)$ કોના બરાબર છે?

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