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[" 4"[" 3.If "sin x+sin y=a," and "cos x...

[" 4"[" 3.If "sin x+sin y=a," and "cos x+cos y=b" ,then "],[qquad tan^(2)((x+y)/(2))+tan^(2)((x-y)/(2))" is equal to "]]

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