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There is a formula that says that sin 7x...

There is a formula that says that `sin 7x=A sin^7 x+ B sin^6 x+ C sin^5 x+D sin^4 x+E sin^3 x +F sin^2x+G sin x+H.` The value of the sum `(A+B+C+D+E+F+G+H),` is (i) `0` (ii)`1` (iii)`-1` (iv) unable to determine

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There is a formula that says that sin7x=A sin^(7)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+C+E+F+G+H), is (i) 0(ii)1(iii)-1 (iv) unable to determine

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