The one unforgivable sin is suicide. Suicide is murder, and there is no time to repent for it before you die. God is a righteous judge with power much greater than man and I'm sure he will let you atone for the sin once you reach the tunnel leading to the gates of heaven, but supposedly, suicide is the one unforgivable sin.
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Y=sin X is a function because for each value of X, there is exactly one Y value.
cosx * tanx = sinx cos x . sin x/ cosx = sinx cos x . sin x/cosx = sinx (cos x is taken out of the equation, leaving sin x = sin x).
[sin - cos + 1]/[sin + cos - 1] = [sin + 1]/cosiff [sin - cos + 1]*cos = [sin + 1]*[sin + cos - 1]iff sin*cos - cos^2 + cos = sin^2 + sin*cos - sin + sin + cos - 1iff -cos^2 = sin^2 - 11 = sin^2 + cos^2, which is true,
Yes, apparantly, it is a form of masturbation wherein you aim to please yourself. One can actually determine if it is a sin or not if we feel at least guilty for what we do. :)
sin(-pi) = sin(-180) = 0 So the answer is 0