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If cosA- sinA= 1, prove that cosA+ sinA=+-1 |
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Answer» Question correct h Given....cos²+sin²-2sincos=1..... Cos²+sin²-2sincos=sin²+cos because(1=sin²+cos)..... 1-2sincos=sin²+cos².. 1=sin²+cos²+2sincos.... 1=(sin+cos)²... +-1 =sin+cos Question is wrong |
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