Math Is Fun Forum

kfarnan

Member

Registered: 2010-09-17

Posts: 4

more trigonmetry

cos x - 2sin x cosx / cos^2x-sin^2x+sinx-1

Is the cos (x) the completed identity?

thnks

soroban

Member

Registered: 2007-03-09

Posts: 452

Re: more trigonmetry

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sameer mishra

Member

Registered: 2010-08-27

Posts: 64

Re: more trigonmetry

hi my friend cosx-2sinx cosx/cos^2x-sin^2x+sinx-1
cosx(1-2sinx)/(-sin^2x-(1-cos^2x)+sinx)
cosx(1-2sinx)/sinx(1-2sinx)   {wherex!=n *pi}
=cotx