It depends if you want the answer in radians or degrees.
Either way, the answer is -0.984807753 degrees or -0.3056143889 radians.
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100 000 000 000
It is 69/10000 = 0.0069
111.1111
(2 sin^2 x - 1)/(sin x - cos x) = sin x + cos x (sin^2 x + sin^2 x - 1)/(sin x - cos x) =? sin x + cos x [sin^2 x - (1 - sin^2 x)]/(sin x - cos x) =? sin x + cos x (sin^2 x - cos^2 x)/(sin x - cos x) =? sin x + cos x [(sin x - cos x)(sin x + cos x)]/(sin x - cos x) =? sin x + cos x sin x + cos x = sin x + cos x
yeah. a sin is still a sin.