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[" In "/ABC sin^(2)A+sin^(2)B+sin^(2)C=]...

[" In "/_ABC sin^(2)A+sin^(2)B+sin^(2)C=],[2" then triangle is : "],[" (1) Equilateral "],[" (2) Right angle "],[" (3) Isoscelles "],[" (4) None "]

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