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[" (d) none of these "],[" 53.If "cos th...

[" (d) none of these "],[" 53.If "cos theta=cos alpha cos beta" ,then "tan((theta+alpha)/(2))tan((theta-alpha)/(2))" is equal "],[" to "],[[" (a) "tan^(2)(alpha)/(2)," (b) "tan^(2)(beta)/(2)," (c) "tan^(2)(theta)/(2)," (d) "cot^(2)(beta)/(2)]]

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