cos²45°-1/cos60°+1/tan45°+cos²30°+sin²45°
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cos²45°-1/cos60°+1/tan45°+cos²30°+sin²45°
cos²45°-1/cos60°+1/tan45°+cos²30°+sin²45°
cos²45°-1/cos60°+1/tan45°+cos²30°+sin²45°
原式=(√2/2)^2-1/(1/2)+1/1+(√2/2)^2
=(1/2)-2+1+(1/2)
=1-2+1
=0
望采纳,谢谢