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8.If sin 6-coso = -ando o90°, then the value of sin1312 -12 |
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Answer» a) is the correct answer sinx+cosx=7/13......,(1) let sinx-cosx=t...........(2)square and add both the equations(sinx+cosx)^2=49/169(sinx-cosx)^2=t^2................................................2=49/169+t^2t^2=289/169t=17/13sinx-cosx=17/13 |
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