If CF =6, CD = 14, and EF = 6, what is the perimeter of triangle CDE

What is this inequality notation? t is less then or equal to 2

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 cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).