If tanx= -1/3, cos>0, then how do you find tan2x?

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May 4, 2018

#tan 2x = (2tanx)/(1 - tan^2x)#
This identity comes in handy, you might want to memorize it.
#=(2(-1/3))/(1 - 1/9)#
#=(-2/3)/(8/9)#
#=-2/3(9/8)#
#= -3/4#

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If tanx= -1/3, cos>0, then how do you find tan2x?

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