Value of sin 1125° is
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Memorize these rules:
sin(-x) = —sin x
cos(-x) = cos x
tan(-x) = —tan x
This is because sine, tangent are odd functions while cosine is even.
So sin(-1125°) = — sin(1125°)
We then find out how far 1125 is from the nearest multiple of revolution (360°) less than it.
360 × 3 = 1080.
So 1125 is 45 greater, and thus
sin(-1125°) = — sin(1125°) = — sin(1080 + 45) = — sin(45°) = 12√
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