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[" 15.यदि "a cos theta+b sin theta=p" तथ...

[" 15.यदि "a cos theta+b sin theta=p" तथा "a sin theta-b cos theta=q," तो सिद्ध कीजिए कि : "],[qquad p^(2)+q^(2)=a^(2)+b^(2)" ."]

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