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tg (–α) =

• tg (–α)

• tg α

• -tg α

• -tg (–α)

cos (–α) =

• cos α

• cos (–α)

• -cos α

sin (–α) =

• -sin α

• sin α

• sin (–α)

ctg (–α) =

• ctg α

• -ctg α

• -ctg (–α)

sin (–30°) =

cos (–60°) =

tg (–45°) =

• 0

• -1

• 1

sin (–90°) =

• 0

• -1

• 1

sin 390°=

tg (–210°)=