Question
Determine the value of Tan2x when
Sinx = -12/13 and 3pi/2 < x < 2pi.
Sinx = -12/13 and 3pi/2 < x < 2pi.
Answers
bobpursley
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)
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)