(sin50°*cos50°)/(cos60°*cos10°)怎样化简

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(sin50°*cos50°)/(cos60°*cos10°)怎样化简
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(sin50°*cos50°)/(cos60°*cos10°)怎样化简
(sin50°*cos50°)/(cos60°*cos10°)怎样化简

(sin50°*cos50°)/(cos60°*cos10°)怎样化简
原式=1/2*(2sinx50cos50)/(1/2*cos10)
=sin100/cos10
=sin(90+10)/cos10
=cos10/cos10
=1

cos60 = 0.5
sin50cos50=0.5sin100=0.5cos10
代入得到
原式=1