cos40*根号下(1+cosx^2)
根号下(sin^2 500°+sin^2 770°*cos^2(1620°-x))
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(1)√sin^2 500°+sin^2 770°-cos^2(180°-x) (180°
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根号下1-2sin160°cos340°除以cos200°+根号下sin200°,求值,