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Determine the value of Tan2x when

Sinx = -12/13 and 3pi/2 < x < 2pi.

1 answer

Tan2x is Sin2x/cos2x

but Sin2x is 2sinxcosx and
Cos2x=1-2sin^2x

you know sinx, and you can find cos x from pyth theorm (sides of thriangle are 13, 12,5)
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