- #1
nzashadow
- 10
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Homework Statement
2/(tanx+cotx)=sinx
Homework Equations
Double Angle Identities, Pythagorean Identities
The Attempt at a Solution
2/(tanx+cotx)=
2/[(sinx/cosx)+(cosx/sinx)]=
2/[((sinx)^2+(cosx)^2)/(sinxcosx)]=
2sinxcosx/[(sinx)^2+(cosx)^2]=
2sinxcosx = sin(2x) =/= sinx
The book I'm getting this problem in says the answer is sinx, however I get sin(2x) which does not equal sinx. I am certain I am right, though I may also be making a stupid mistake :P