જો $\cos (A-B)=3/5$ અને $\tan A \tan B=2$ હોય,તો નીચેનામાંથી કયું સાચું છે?

  • A
    $\sin (A+B)=1/5$
  • B
    $\sin (A+B)=-1/5$
  • C
    $\cos (A-B)=1/5$
  • D
    $\cos (A+B)=-1/5$

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$\frac{\cos 10^o + \sin 10^o}{\cos 10^o - \sin 10^o} = $

$\cos \alpha \sin (\beta - \gamma ) + \cos \beta \sin (\gamma - \alpha ) + \cos \gamma \sin (\alpha - \beta ) = $

જો $\sin A = \frac{1}{\sqrt{10}}$ અને $\sin B = \frac{1}{\sqrt{5}}$,જ્યાં $A$ અને $B$ ધન લઘુકોણ છે,તો $A + B = $

$\sin 15^{\circ}$ નું મૂલ્ય શોધો.

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