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y = √r^2 - x^2
y = √5^2 - 4^2
y = √25 - 16
y = √9
y = 3
Tan x = y/x = 3/4
Tan 2x = (2tanx)/(1-tan^2 x)
Tan 2x = 2(3/4)/1-(9/16)
Tan 2x = 3/2 / 7/16
Tan 2x = 24/7