- #36
tiny-tim
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hayowazzup said:cosψ.cos2θ - sinψ.sin2θ = -99921/121√101,
cos (ψ+2θ) = -99921/121√101,
ψ+θ = cos-1 (-99921/121√101)
θ = cos-1( -99921/121√101 )- 5.71059
No, it's ψ+2θ = cos-1 (-99921/121√101),
so 2θ = cos-1( -99921/121√101 )- tan-1(10) …
cos is negative for angles > π/2.but is cos-1( -99921/121√101 ) possible?
(oh, and 99921 is still wrong, and tan-1(10) isn't 5.71059. )