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Cos 2X Identity, Graphing & Formula

SOLVED: Find the exact values of sin 2u, cos 2u, and tan 2u using the double-angle formulas.Given: cos u = -4/5, 0 < u < π/2To find sin 2u, we can use the double-angle formula for sine:sin 2u = 2sin u cos uTo find cos 2u, we can use the double-angle formula for cosine:cos 2u = cos^2 u - sin^2 uTo find tan 2u, we can use the double-angle formula for tangent:tan 2u = (2tan u) / (1 - tan^2 u)