1+cota+tana)(sina-cosa)=seca/cosec^2a-cosec/sec^2a
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Step-by-step explanation:
=(1 + cosa/sina + sina/cosa)(sina-cosa)
= sina + cosa +sin^2 a /cosa -cosa -cos^2 a /sina - sina
= Sin^2 a /cosa - cos^2 a /sina
= Seca/cosec^2 a - coseca /sec^2 a
Hence ,proved
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