1) sin(180°- a) = sin(a)
2) cos(180°-a) = -cos(a)
3) sin(90°-a) = cos(a)
4) cos(90°-a) = sin(a)
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Answers & Comments
1) sin(180°- a) = sin(a)
2) cos(180°-a) = -cos(a)
3) sin(90°-a) = cos(a)
4) cos(90°-a) = sin(a)