C3 Trigonometry
Can't seem to find an answer for this online anywhere...
cosx + sinx = 1/3 With results from -π<x<π
Thanks
cosx + sinx = 1/3 With results from -π<x<π
Thanks
(edited 9 years ago)
Original post by Aarry
Can't seem to find an answer for this online anywhere...
cosx + sinx = 1/3 With results from -π<x<π
Thanks
cosx + sinx = 1/3 With results from -π<x<π
Thanks
R transformation
or
little t identities
or sine or cosine to the other side, square and solve
(careful because you will have extra solutions with this method)
Original post by TeeEm
little t identities
little t identities
Do you mean the half-angle tan identities?
Original post by notnek
Do you mean the half-angle tan identities?
I think they are the same?
e.g. sinx=2t/(1+t^2) where t=tan(x/2)
I called them "little t".
Original post by TeeEm
I think they are the same?
e.g. sinx=2t/(1+t^2) where t=tan(x/2)
I called them "little t".
e.g. sinx=2t/(1+t^2) where t=tan(x/2)
I called them "little t".
Yes I'd just never heard them being referred to as "little t" idenities but I quite like it
Much better than "Weierstrass substitution identities".
Original post by notnek
Yes I'd just never heard them being referred to as "little t" idenities but I quite like it
Much better than "Weierstrass substitution identities".
Much better than "Weierstrass substitution identities".
although I often come up with "silly" names for things, I am sure I have seen them quoted as "little t" identities in more than one source.
Original post by TeeEm
R transformation
Original post by VannR
R-transformation. This is 100% without-a-doubt the "A-Level" method of solving this equation.
Does this mean Harmonic Form?
Original post by TenOfThem
Does this mean Harmonic Form?
sorry, yes I call it R transformation instead of its proper name.
Original post by TenOfThem
Does this mean Harmonic Form?
http://www.intmath.com/analytic-trigonometry/6-express-sin-sum-angles.php
Not sure if we're talking about the same thing, though. We probably are!
Original post by VannR
http://www.intmath.com/analytic-trigonometry/6-express-sin-sum-angles.php
Not sure if we're talking about the same thing, though. We probably are!
Not sure if we're talking about the same thing, though. We probably are!
we are
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