——Is Dongting Lake the largest lake in China?——No, it's the second ____ one ____ all the lakes in China.
A:large, in
B:largest, of
C:larger, of
D:the largest , in
①cos(-60°)=—cos60°= −12
②sin75°=sin(30°+45°)=sin30°·cos45°+cos30°·sin45°= 6+24
③sin2x=sin(x+x)=sinx·cosx+cosx·sinx=2sinx·cosx;
④sin(x-y)=sinx·cosy-cosx·siny.
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