1/squareroot2
ummm, yes, but be aware that square root 2 is an irrational number that has *no* exact value.
So your question cannot be answered in the terms you asked it. You can use a calculator to get as much precision as you want, but never an *exact* answer.
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sin(405) = square root of 2 divided by 2 which is about 0.7071067812
SQRT(3)/4 - 1/4
tan(135) = -tan(180-135) = -tan(45) = -1
sin(40o) = 0.6428
2.59 * 2.5 * 6 = 135