作业帮①sin(-π/4)②sin13/6π③cos5/4π④tan(-7/4π)⑤-cos(-300°)⑥sin495°
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①sin(-π/4)②sin13/6π③cos5/4π④tan(-7/4π)⑤-cos(-300°)⑥sin495°
①sin(-π/4)②sin13/6π③cos5/4π④tan(-7/4π)⑤-cos(-300°)⑥sin495°
①sin(-π/4)②sin13/6π③cos5/4π④tan(-7/4π)⑤-cos(-300°)⑥sin495°
①-√2/2②1/2③同① ④1⑤√3/3⑥同①