sin(-u) = – sin u
| cos(-u) = cos u
| tg (-u) = – tg u
| ctg (-u) = – ctg u
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sin(p–u) = sin u
| sin(p+u) = – sin u
| cos(p-u) = – cos u
| cos(p+u) = – cos u
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sin(p/2–u) = cos u
| sin(p/2+u) = cos u
| cos(p/2-u) = sin u
| sin(3p/2–u) = -cos u
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cos(p/2+u)= –sin u
| sin(3p/2+u) = -cos u
| cos(3p/2-u) = –sin u
| cos(3p/2+u) = sin u
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sin2 u+ cos2 u = 1
| 1+tg2u = 1/cos2u
| 1+ctg2u = 1/sin2u
| 2sin u cos u = sin2u
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cos2u = cos2u-sin2u = 1-2sin2u = 2cos2u-1
| sin2u = (1– cos2u)/2
| cos2u = (1+cos2u)/2
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sin a sin b = (cos(a–b)–cos(a+b))/2
| sin u = 2tg(u/2)/(1+tg2(u/2))
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cos a cos b = (cos(a–b)+cos(a+b))/2
| cos u = (1–tg2(u/2))/(1+tg2(u/2))
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sin a cos b = (sin(a–b)+sin(a+b))/2
| arcsin a + arccos a = p/2
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sin a + sin b = 2sin cos
| sin a – sin b = 2sin cos
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cos a + cos b = 2 cos cos
| cos a – cos b = –2 sin sin
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