Eta:
sin(−α)= −sinα , cos(−α)= cosα
sin(α−180
o)= −sin( 180
o −α)= − ( −sinα)= sinα
cos(450
o −α)= cos[ 360
o +(90
o−α)]= cos( 90
o−α)= sinα
sin(540
o +α)= sin[360
o+( 180
o +α)]= ......... = − sinα
cos(−270
o +α)= cos[− ( 270
o −α)]= + cos(270
o−α)= − sinα
teraz dokończ .........
