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[" 22.If "(x)/(a)cos alpha+(y)/(b)sin al...

[" 22.If "(x)/(a)cos alpha+(y)/(b)sin alpha=1,(x)/(a)cos beta+(y)/(b)sin beta=1" and "],[(cos alpha cos beta)/(a^(2))+(sin alpha sin beta)/(b^(2))=0," then "],[[" (a) "tan alpha tan beta=(b^(2)(x^(2)-a^(2)))/(a^(2)(y^(2)-b^(2)))" and "x^(2)+y^(2)=a^(2)-b^(2),],[" (b) "tan alpha tan beta=,(a^(2))/(b^(2))],[" (d) none of these "]]

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