(cos(4x)-cos(8x))/(cos(4x)+cos(8x)) =tan(2x)tan(6x)

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Select the correct answer from the drop-down menu. subtracting 3xy^2 from 8xy^2 gives the same result as the expression. [tex]3xy ^{2} - 8xy ^{2} [/tex][tex] { - 7xy}^{2} - {2xy}^{2} [/tex][tex] {7xy}^{2} - {2xy}^{2} [/tex]

If i have 20$ and i gave 5$ away how much i got