$1 - 2{\sin ^2}\left( {\frac{\pi }{4} + \theta } \right) = $

  • A
    $\cos 2\theta $
  • B
    $ - \cos 2\theta $
  • C
    $\sin 2\theta $
  • D
    $ - \sin 2\theta $

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$(\cos \alpha + \cos \beta )^2 + (\sin \alpha + \sin \beta )^2 = $

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જો $\tan(A + B) = p$ અને $\tan(A - B) = q$ હોય,તો $p$ અને $q$ ના સ્વરૂપમાં $\tan(2A)$ ની કિંમત શું થાય?

સાબિત કરો કે: $\sin 3x + \sin 2x - \sin x = 4 \sin x \cos \frac{x}{2} \cos \frac{3x}{2}$

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કિંમત શોધો: $\sin (\beta + \gamma - \alpha ) + \sin (\gamma + \alpha - \beta ) + \sin (\alpha + \beta - \gamma ) - \sin (\alpha + \beta + \gamma )$

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