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[" There is a formula that says that Put...

[" There is a formula that says that Put "x=T_(2)],[qquad sin7x=A sin^(2)x+B sin^(6)x+C sin^(5)x+D sin^(4)x+E sin^(3)x+F sin^(2)x+G sin x+H" ."],[" The value of the sum "(A+B+C+D+E+F+G+H)" is "],[[" (A) "0," (3) "1," (C) "-1," (D) nct possible to determine "]]

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