Use identities to find values of the sine and cosine functions of the function for the angle measure. 2∅, given sin ∅ = √3/5 and cos ∅ <0 cos 2∅ = (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)
sin 2 ∅= (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.)