1. sin(180) =?
sin(180)= sin(90+90) = cos90 = 0 | formula :- sin(90+A) = cosA
sin(180) = 0
2. sin(360) =?
sin(360) = sin(270+90) = -cos90 = 0 |formula sin(270+A) = -cosA
sin360 = 0
3. sin(-90) =?
sin(-90) = -sin90 = -1 | sin(-A) = -sinA
sin(-90) = -1
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