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cosx + sinx =√2,cosx - sinx=?
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cosx + sinx =√2,cosx - sinx=?
square the equation first then you get 2sinxcosx=1 then sin2x=1 therefore x= π/4 hence sinπ4 - cos π4 = 0
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cosx + sinx =√2,cosx - sinx=?
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cosx + sinx =√2,cosx - sinx=?
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