求值:sin21/4π tan(-23/6π) cos1500°
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求值:sin21/4π tan(-23/6π) cos1500°
求值:sin21/4π tan(-23/6π) cos1500°
求值:sin21/4π tan(-23/6π) cos1500°
sin21/4π tan(-23/6π) cos1500°
=sin5π/4tanπ/6cos60°
=-sinπ/4*√3/6
=-√2/2*√3/6=-√6/12
求值:sin21/4π tan(-23/6π) cos1500°
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