Establish the identity.tan 2 u (1 + cos(2u)) = 1 - cos(2u)

What will be an ideal response?

tan 2 u (1 + cos(2u)) = (1 + cos(2u)) = 1 - cos(2u)

Mathematics

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Solve the system by the elimination method.2x + 6y = -5-10x - 30y = 25

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