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सिद्ध कीजिये कि y=Acosmx+Bsinmx अवकल समी...

सिद्ध कीजिये कि `y=Acosmx+Bsinmx` अवकल समीकरण `(d^(2)y)/(dx^(2))+m^(2)y=0` का हल है।

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