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[((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^(2)c...

[((a+b+c)(b+c-a)(c+a-b)(a+b-c))/(4b^(2)c^(2))" equals "],[[" (a) "cos^(2)A," (b) "sin^(2)A],[" (c) "sin2A," (d) "cos2A]]

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