Sin 300 cosec 1050 -tan(-120)
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Sin300=sin(270+30)= -cos30
Cosec 1050=cosec (3x360-30)= -cosec30
Tan(-120)=tan(270-30)=cot30
-cos30-cosec30-cot30= -(3^1/2)/2x-2/1-3^1/2=3^1/2-3^1/2
=0
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