计算sin(-1665°)+cos(-330°)-tan1200°.要过程.

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计算sin(-1665°)+cos(-330°)-tan1200°.要过程.

计算sin(-1665°)+cos(-330°)-tan1200°.要过程.
计算sin(-1665°)+cos(-330°)-tan1200°.要过程.

计算sin(-1665°)+cos(-330°)-tan1200°.要过程.
sin(-1665°)+cos(-330°)-tan1200°
=sin(-1665°+1800°)+cos(-330°+360°)-tan(1200°-1080°)
=sin135°+cos30°-tan120°
=sin(180°-45°)+cos30°-tan(180°-60°)
=sin45°+cos30°+tan60°
=√2/2+√3/2+√3
=√2/2+3√3/2

=sin(1800°-1665°)+cos(360°-330°)-tan(1200°-1080°)
=sin135°+cos30°-tan120°
=√2/2+√3/2+√3
=√2/2+3√3/2