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प्रश्न
`sin^-1(sin (13pi)/7)`
उत्तर
We know
`sin(sin^-1theta)=theta if - pi/2<=theta<=pi/2`
We have
`sin^-1(sin (13pi)/7)=sin^-1{sin(2pi+pi/7)}`
`=sin^-1(sin-pi/7)`
`=-pi/7`
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