作业帮求sin(―1200°)·cos1290°+cos(―1020°)·sin(―1050°)+tan945°的值．
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求sin(―1200°)·cos1290°+cos(―1020°)·sin(―1050°)+tan945°的值．
求sin(―1200°)·cos1290°+cos(―1020°)·sin(―1050°)+tan945°的值．
求sin(―1200°)·cos1290°+cos(―1020°)·sin(―1050°)+tan945°的值．
如图
求sin(―1200°)·cos1290°+cos(―1020°)·sin(―1050°)+tan945°的值．
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