anonymous
  • anonymous
Find tan2θ if tanθ = -1/2 -4/3 -1 -4/5 -3/4
Mathematics
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
@Tommynaiter
anonymous
  • anonymous
i have no idea how to do any of it
Nnesha
  • Nnesha
do you know sum and difference identities ?

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Nnesha
  • Nnesha
I mean double angle formulas ?
anonymous
  • anonymous
nope i wasnt taught any of this and im over half way done with the course
Nnesha
  • Nnesha
|dw:1449844340641:dw| according to double angle formulas \[\large\rm \tan(2 \theta)=\frac{2 \tan \theta}{1-\tan^2 \theta}\]
Nnesha
  • Nnesha
here is good link with all identities http://www.analyzemath.com/trigonometry/trigonometric_formulas.html you need to familiar with these in order to do trig :=))
Nnesha
  • Nnesha
now just use the given information tan theta=-1/2 plug that in
anonymous
  • anonymous
im so confused
Nnesha
  • Nnesha
find \[\large\rm \tan2θ \] use the double angle formula `tan2θ ` can be written as \[\frac{2 \tanθ }{1-\tan^2θ }\] and since tan theta =-1/2 you can replace all tan with -1/2

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